The Power of X to unlock Family Mysteries (Martin Hayden)
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Martin Hayden, a genetic genealogist from County Kildare, presented on how the unique inheritance patterns of the X chromosome can unlock complex family mysteries that traditional records and autosomal DNA alone cannot solve. He emphasized that effective genealogy requires combining DNA testing with thorough paper research, noting that while autosomal DNA diminishes after six to seven generations, the X chromosome follows a specific path governed by the Fibonacci sequence. This distinct inheritance mechanism significantly narrows the pool of potential ancestors compared to standard DNA matches, offering a powerful tool for tracing lineage back many generations without the usual signal degradation.
The core of this analysis lies in understanding that males inherit their single X chromosome entirely from their mother, whereas females receive one from each parent; crucially, a father passes his X chromosome intact to all his daughters without any recombination, while his Y chromosome goes to his sons. Because the X chromosome only recombines when inherited through a female line, observing an unbroken segment spanning several generations indicates that the ancestor in question was male, effectively skipping generations in the transmission chain. This lack of recombination in the male line allows researchers to trace specific DNA segments with high precision, distinguishing between different ancestral lines that might otherwise appear identical based on surnames or location alone.
Hayden illustrated these principles through a case study involving an adoptee who had a significant X-chromosome match but reached a dead end relying solely on surname assumptions. By analyzing the specific inheritance paths and utilizing phasing data from cousins, he determined that the match originated from a maternal line where the X chromosome was passed down unchanged through a male ancestor, resolving the mystery despite common pitfalls like pedigree collapse or misleading surnames. To maximize the effectiveness of such analysis, he recommended building family trees back to at least great-grandparents to enable accurate phasing without parental data, linking known relatives in databases, and using visualization tools to map segments, noting that transferring data to platforms offering X-chromosome browsers is essential for detailed investigation.
The presentation concluded that while not all testing companies provide advanced X-chromosome browsing tools, the strategic application of these genetic principles combined with robust tree data can successfully resolve difficult family connections and preserve history for future generations. Hayden invited viewers to reach out with specific questions regarding their own X chromosomes before ending the session due to time constraints, reinforcing the idea that careful attention to these unique inheritance patterns transforms DNA from a simple match list into a detailed map of one's ancestral journey.
Read the full video transcript
ok ladies and gentlemen we are ready to
proceed with our next speaker and it
gives me great pleasure to introduce
Martin Haven to you mark will be talking
to us about the power of the X
chromosome and he is from County Kildare
he's from the border of Kildare nation
Carlo in a place called Castle German
and 14 of his 16 that great great
grandparents are from Castle Germany so
if you put Orkney into a juicer you'd
get the purest form of Castle German -
nein no not recommend this just an
observation so what is a member of ISIL
the Irish genealogical research society
and the Irish made of a record society
but he works by day as a principal
analyst and modeler for transport to
London but his knife job is sitting in
front of his computer and dabbling with
genetic genealogy there's no better
person to talk to us about the power of
the X chromosome please give him a warm
welcome
well firstly I'd just like to say thank
you very much to marason for inviting me
to come and speak today and I have to
say this is the first time I've spoken
at a genealogy conference so hopefully
all goes well but I just thought I'd
give a little bit of an overview of what
we're going to look at and then a little
bit just about me is my first time up
so I'm going to do a little bit of an
overview on the DNA so before I get into
the X chromosome and I will I know it's
been touched in other lectures but I
will touch a little bit on autosomal on
Y and on mitochondrial and I'll talk
about the importance of DNA testing and
tradition of genealogy because they
don't exist in isolation we need both
the paper records and and the other type
of records to work alongside the DNA and
Martha's previous talk evidence of of
how that can come together and I'll
introduce the X chromosome
I will give
a talked a little bit about the
inheritance patterns of X which are
quite different and exit being neglected
quite a lot so I think it's quite nice
to focus a little bit on X and then DNA
tests that facilitate crawl X chromosome
analysis and I worked example of
discovery so I do have a tree in here
the names have all been changed to make
an anonymous foot it is a real situation
but I have to protect identities and
that because an adoption and that
involved in it so it's only it's only
fair to change it and a little bit about
making DNA work for you and I conclude
to conclusion so me I'm from parish of
castle Dermot had come from 20 miles
outside to village my parents are
farmers and currently living and working
in England and I was interested in
genealogy from a teenager I was lucky
enough to remember my grandparents who
passed away mostly via teas in the 90s
so when I was a child they were able to
tell me about the First World War and
when they were children hello in the
Second World War so I had first-hand
experience of what life is like in 1910
1912 my grandfather even told me that
he's one of his earliest memories was
the sinking of the Lusitania that was in
1915 and when it was under papers and
stuff like that so it got me interested
in history and in school I did both I
was leaving certificate search history
and I did biology as well so the history
and the biology coming together was a
good a good way of doing genetic
genealogy and I did my first DNA test in
January 2017
and now I've tested with everything and
transferred it to my heritage and tested
over 20 members and I've done quite a
few big white tests of mitochondrial
tests as well and I like to advocate for
genealogy and for those that might be
seeing this on the web that's why I
don't kind so it's carry on I run I run
a project a small project contrast
environment DNA connections it's got 68
members now since that was put up and a
pow
20% of them are my family essentially
and then the rest are other people that
I've got through writing certain
people's trees and if I find people and
Family Tree DNA I have got an ancestor
in castle diamond or whatever I write
them and asked them if they're
interested in joining the project and I
always try to give them something back
so I'll always try and research some
ancestor for them in the records are go
out and look at a grave or do something
like that or get my mum to do it because
I live in so my mom does but it's it
always feel that if they are giving me
the access to the DNA it's nice to give
something back in return and then it's a
kind of a two-way process and it
encourages other people to get involved
the project is combined the cover is
also man XY and by the country oh and
it's very useful because having grown up
there
I've got familiarity with the towns
lines and the town's lands are very
useful for finding families especially
if you've got many families with the
same surname you can say oh you're that
branch of that family are you're that
branch of that family and one way as one
way I contribute to the genealogy
community outside my own personal family
research now and I also run I have
another little private project that I
run with these people on a genealogy on
the basis and that's a cross for England
and Ireland so a little tiny bit done on
just what are our aims and objectives in
genealogy to make new family discoveries
find new cousins I found Lords all
across America so I couldn't have a
holiday in every state now from Alaska
to Florida to California Caputo
everywhere construct an accurate
genealogy for future generations I think
we're a generation of people who have
got a lot of all the people and
everything that's taller stories that
can start to get lost as people start to
move around as Maura said I
start that my family have been in the
para tu casa da which means out to their
for a long time a good a good number of
the branches of it but people like now I
live in England so people are starting
to move more than they did and I think
it's getting that genealogy together why
we still have got the information and
trying to build it back and preserving
it for future generations
finding new cousins and developing and
pedigree over many generations and I'm
back on the most part to my third
great-grandparents and a couple I've got
I think had four great grandparents are
going into the late seventeen hundreds
answers the question Who am I and where
do I come from and help unearth
genealogical him
info and I think one of the biggest
things for me is I like preservation and
as preserving our genealogical history
so for me a lot of it is kind of
preserving and trying to make things
that future generations would be able to
get so genetic genealogy and the use of
DNA to match clothes in distant color
cousins we can we can get and then it
gives us information about our admixture
now for me it's quite boring because
it's British and Irish all the way
through merely I don't have anything
anything exciting but it is good in
terms of ethnicity to give us an idea of
for our ethnicity years but as I say a
lot of the work I do is looking at the
cousin matching and look at how we match
but it does give us an idea of if you
have something that's different in there
it's another branch to follow and it
opens up a new area of excitement all of
of a different technology than you might
otherwise thought so
in terms of ethnicity I don't focus too
much on the accuracy but if you've got
something that's a high proportion of
Asian or African or something else
Native American it gives you something
else to look at and it also gives us
more about our deep ancestry on why DNA
and mitochondrial DNA so before I get
into the X chromosome I just saw I recap
on a little bit about the autosomal
why DNA and mitochondrial DNA as we've
mentioned on some other talks the first
22 pairs of chromosomes are the our or
sawmill DNA so we've got an all like
23andme talks about our 23 but we've
really 46 because it's one from each
parent
we includes the X chromosome under 23rd
pair its male and female and it's
inherited from our parents Y DNA is one
of the sex-determining chromosomes on
the 23rd pair so from females it's xx
and for males it's X Y and the y
chromosome has the sry gene and that's
what turns on the male the male
development and produces male from the
XY and it's the smallest the smallest
chromosome and it's about fifty nine
thousand a million base pairs so it's
one of the smallest chromosomes
I think 21 is the smallest of a solver
and that the Y is even smaller than that
and finally the mitochondrial DNA it's
the power or as I call it the power
station of the cell if you like and it's
got this special type of of inheritance
patterns while the Y DNA is on the male
line oddly the my country of the DNA
follows the female line all of the way
back and why DNA can only be taken by
male testers but and mitochondrial can
be passed down by male and female where
they all need n goes to the next
generation true daughters true true
women because it's tears in the egg so
it's only come passed through the agency
so it doesn't it doesn't go from from
sons to the next generation only goes
from daughters for the next generations
so autosomal DNA inheritance parents is
inherited the same way across all of the
22 autosomes so every one of us get 22
pairs for my father and her mother with
all 24 chromosomes in our standard or
normal DNA and we were exactly half our
parents so when we talk about
differences with
it's because our siblings got different
bit of both our parents than we did
because it unless we were exactly
identical earth but monozygotic twins
everyone I'm sorry it's a bit different
whereas in that case you're identical
because you're coming from they're from
the same single fertilized egg and we
therefore inherited a different
proportion of our grandparents and I
think I've tested all of my siblings bar
one and it gives me a really good
example of how I can say right I'm
slightly more my maternal grandfather
whereas one of my brother's is
definitely slightly more about his might
paternal grandmother and I can start
from looking at cousins in your soma how
that's broken down so just before we
move on to the expert here we are giving
an example of the autosomal
recombination so up at the top here
we've got all of the great-great
grandparents or 16 of those you can see
that how it's passed on to the
great-grandparents the grandparents the
parent and then the rainbow stripes down
at the bottom they it that's the reason
why or a sawmill dough becomes less
useful after six seven generations is
because the stripes become narrower and
narrower and narrower and it's hard to
determine and how to break them out
because and then all of a sudden you can
start to have be missing parts from up
here because maybe one of the great
great grandmother's DNA got left behind
somewhere here that doesn't pass down so
so that's one of the limitations of the
autosomal and the other graph is just
showing the 22 autosomes and here we
have the male with the XY at the female
with the x tanks so what is the X
chromosome so now we're on to the main
part of of this topic after doing a
little bit of background so there's the
X chromosome up in the corner an X
chromosome is one of the two sex
determining chrome sorts 150 not 9 150
five million base pairs so we have three
billion base pairs and the x-chromosome
is about 5.2 percent of of our makeup
and it's similar in size to chromosome 7
so you can see the image from 23andme
shows the X chromosome here is quite
long and if you go to number 7 it's
nearly the same size so it's nearly the
same size as chrome and so on number 7
and it was discovered in 1890 by a
scientist in Germany and it was called X
because it was unusual and actually the
Y chromosome was discovered a little bit
later it was called Y because Y he
follows X and it was considered unusual
because meiosis in certain in certain
circumstances wasn't taken place so it
was proven that it was it hadn't got the
crossover and that was in in in in the
male's there was no crossover with the Y
and that's why they discovered that it
actually was slightly difference in
performance and why it was so
indifferent about it than me than the
other chromosomes that were identified
at that time and females will have more
X chromosome matches than males by
virtue of having two X chromosomes so
we'll be able to look at that in a
minute and how it would come out but one
of the things that I find the way nature
works in the way of mathematics works is
kind of amazing really so like what does
the X chromosome have in common with a
sunflower at North West and the galaxy
Andromeda that's our nearest galaxy well
it's because they follow they follow the
Fibonacci sequence of numbers and so
does the X chromosome and the Fibonacci
sequence is an Italian mathematician and
it works on that you're adding the
number that you previously had before so
1 and 1 of 2 + 2 + 3 is 5 + 5 + 3 is 8 8
+ 5 is 13 and so forth I when I was
looking at this about six months or a
year ago so now I've got to work out how
many eggs inherit it numbers I haven't
different generations because you've got
two parents and four grandparents and
here great grandparents and so forth
well I don't really have to think about
it anymore because it works on the
Fibonacci sequence so it's very easy and
quick to work out the inheritance
pattern of the X chromosome so male
inheritance crawl pattern here and this
has come from plain Bettinger I've
images and he's got a very good book and
good website laws of information and
that's where I do a lot of my background
really and male inheritance you can see
you're starting at one and one
so you've female and then it's 2 3 5 8
13 21 so you're exactly going up on that
true the Fibonacci sequence and every
one of those colors where you can look
to get your X chromosome so like for
example at your great-grandparents level
you can see they would come through my
paternal through my mom through my
grandfather and then through my
grandfather's mother and then through my
grandmother and grandmother and then you
would see I'm coming through both my
grandmother's father and grandmother's
mother so you can see that with the X
chromosome you're narrowing down the
possibilities to search so rather than
having the broad 16
great-great-grandparents 22 grade grade
grades you're actually narrowing down
the field and then I talked a little bit
more in a couple of minutes about how
segments are passed on and how it can be
quite long and then the female gets the
X chromosome from her dad as well so
again you have this sequence now the
Fibonacci sequence works on both sides
of the three so it's half and half and
when you're counting one on the male
inheritance you usually can count the 1
if you like from from the mother because
there's only one and what whereas on a
female you can count from herself
because you've got one two and then
you're going
and you can count on each side but you
can see therefore that with the with the
inheritance patterns we have a much
reduced field to work with then then
full-auto somos and it gives us a more
concentrated and targeted way to solve
problems and that's one of the things
that this will demonstrate how I managed
to do that I think one thing that's
important to mention there's a lot and
sometimes it can be mixed up with
mitochondrial DNA and X DNA X DNA has
numerous different inheritance patterns
from so yeah where is the mitochondrial
is only on the line of the female coming
right back so it's all in a very pink
line on the very edge of the male
inheritance of female inheritance that
you're only like now X chromosome has
fewer inheritance possibilities than the
full or so on as you only inherit the X
chromosome from female ancestors and in
my case I inherited X chromosome from my
mom and she expects inherits from her
parents and I don't get anything in
terms of X from my dad so from my dad's
side I need to go to my sister and I
then inherit some X chromosome from both
my maternal grandmother's parents put
only from my maternal grandfather's
mother and so on and the unique pattern
allows us to identify unique ancestral
paths in our genealogical research so my
mum and dad are made infamous you can
see here this is from Family Tree DNA
and my mum and dad I've got a next match
with my mom as you can see but I've got
nothing from my father so this is sure
that the X match comes down and here I
feel and just chromosome 22 and this is
with and my mom on the top and my dad on
the bottom as you can see I've got a
full X chromosome from my mom and
nothing from my father and on the
23andme the same 21 22 an X from my home
from my dad X's blank so there that's
showing basically D
inheritance coming down and one thing
I'm going to touch on in a minute is you
see there's an a male here and a female
there that's because I've linked my
family tree to me and to my mom and dad
which means my DNA as fears that that
becomes relevant in a few minutes so
everywhere I look under the Family Tree
DNA wherever I've got a female it means
that they are related to me trying out
through my mother and everywhere I've
got a male line they're related to me
through my father and this is the
importance of why we need to try and
encourage people to put in a family tree
into Family Tree DNA and Link any
cousins that we know to be related so
anybody in our lists that we've
identified if we can link them in to our
tree of course does who they will remain
private if they're living naturally to
you only we were cedar but then you can
connect to DNA and it will fears it and
that becomes relevant to sort in this
family mystery in a couple of minutes
how having your day affairs halves the
work and have the job because you know
which side of the family you're dealing
with so 23andme
then I was just going to mention a
couple of the things about the
chromosomes and crook'd
and 23andme gives you a breakdown in
ethnicity on the chromosomes and you can
see here is the on the eggs that is
saying that I'm largely Northwestern
European where a little bit of broadly
European now that's because I've used a
tighter confidence level on this you can
set different confidence levels if I
went to a 90% confidence level this is
what I get if I went back to a 50%
confidence level is going to change the
color of this to being British and Irish
because if you're less confident you can
give more accuracy if you're more
confident the accuracy causes a little
bit but this again when people are
looking at the X chromosome if they have
tested with 23andme
they can actually determine especially
if you've got any ancestry or ethnic
that of a broader spectrum maybe from
some native-american African Asian you
can see if that's coming through any
excrements on where as you can see all
my family coming from island it's
there's blue but I thought it's just
what put pointing that out and one of
the other things I wanted to just point
out was a DNA painter this is an atoll
by Johnny Palin he is given an talk at
3:30 today and it's an excellent tool
and it's invaluable in how to try and
match these segments and from Martin's
talked earlier about going back and
trying to match these segments from 1830
na in 20 I have a mic on my one there's
a little yellow one here that's a known
for cousin so that part is from my
great-great-great grandparents that
little bit there and again I put that in
because you can see on the X chromosome
where different segments are coming from
and I can tell you that that segment is
coming from my maternal
great-grandfather and that's coming from
my materials my mum's great-grand from
my mum's grandmother so that's on my
mom's grandmother and that's my mom's
grandfather great-grandfather yeah so
you can actually from the segments here
start to determine where your matching
with with the X chromosome and then if
you paint in no one matching cousins you
can try to see exactly where they're
going to fit so I would definitely
recommend if you haven't already looking
at DNA a painter and on that the clause
as well I've I have in is my aunt and
uncle and I'm going to create another
one take it my aunt and uncle out so I
can get more information on more
discipline segments so X chromosome is
used to narrow down complex cousin
matching and identify particular lines
of relationships it's different from
females and males which we've seen a
couple of minutes ago and no
recombination with X chromosome in
Mayor's now that's very important
because a female's paternal X chromosome
is identical to that of
grandmother because if it's coming
through her father and he can't
recombine the combined with the white
y-chromosome the father is passing on
his mother's x-chromosome intact so a
female sex chromosome is that from her
paternal grandmother identically so
there will be and crossover and
recombination from her
great-grandparents but it's very useful
because if you go back further
generations and start to look at X it
means you can get very very long
segments and that's what's what's vital
where you might get shorter segments in
the general autosomal if you've got
something that's coming down from a male
female male female pattern you can get
very very long segments and that's
something you should look out for with
the X form and so on which your DNA map
if you go back through will see have I
got any really long X chromosome
segments because that's very very
interesting and do it it's not advisable
to use X matches where a segment is less
than seven centimorgans even I would say
Ted incentive organs if it's very short
it probably is accidental and because
like there can be a certain amount of
and endogamy especially an Irish rural
communities where back to the or fourth
or fifth cousins you have people Marian
that's actually your descendant from two
different lines now I haven't actually
found that yet but I'm sure that in my
generation before the one I've got it
exists because I've got some matches
with people that are married into the
family rather than be my family so I
said some went on back about maybe
between seventeen twenty five and a
hundred in that area in that time to
give a pedigree collapse but that's why
it's not really worth looking at
anything that's very short you're
looking with X chromosome to look for
long segments now and so you sitting
sources Family Tree DNA offers a
chromosome browser and the next
chromosome
23andme offers a chromosome browser and
the X chromosome as well
ancestry doesn't provide an increment on
browser he provides the X chromosome in
raw data so you need to transfer that
and you can transfer that into Family
Tree DNA in order to transfer you need
to pay the $19 which unlocks the DNA and
you can use then the chromosome browser
and I will said I don't understand today
there is a cord that's unlock fee for $9
so if anybody is going to transfer into
Family Tree DNA now is the time to do it
I get the $9 transfer fee which is very
very cheap and my heritage has a
chromosome browser but it doesn't
actually do the X chromosome it only
does the autosomes 1 to 22 so again you
need to transfer and you can transfer it
to Family Tree DNA living DNA it has the
setup for it but it's not quite there
yet so living DNA is one of the newer
testing companies it's currently under
development and I should imagine it
eventually get there but at the moment
you again have them download the raw
data and the last thing I wanted to
mention who is as well as Family Tree
DNA you could always transfer into jet
match now I'm a little bit cautious with
jet match at the moment because of the
fact it's been taken over by this new
barrage and company and I'm very very in
for protecting people's DNA and all of
these issues with law enforcement and
stuff so I'm beginning to open up to the
fact that jet match is probably going to
be ok and that this company will take
seriously those people those choices are
option opted out but again like was
mentioned in in an earlier presentation
we need to understand what we're doing
with our data at the terms and
conditions be make sure that the testers
especially if you're managing many
testers like I do that they know and are
happy with what you're doing so I would
say judgment yes but with Kosh and make
sure you've looked at make sure you're
comfortable before you do it and with
family
DNA you can opt out of the law
enforcement it's in the it's in the it's
in the mattress as well and I just think
it's fair that we always mentioned that
when you're transferring DNA from other
companies that people are aware you know
what you're doing get me two now so now
this is the part where I'm going to
explain how I use the X chromosome to
sort out a little problem a match
appeared in a family DNA kit that was a
match a hi match with the kit owner and
here we are we've got a cousin a second
cousin to third cousin 208 year 200 near
in centimorgans and 42 was the longest
segment and an X match I said earlier
that if you have pairs and with the
great thing with Family Tree DNA is you
can fares against cousins you don't have
to have your parents and if you've got a
first set set go down to second cousins
you can actually fairs and look you see
I've got against this cousin it's a man
with a symbol but it's got the female
symbol so I knew that this was on the
female site so that meant on the male
side I could discard all of that side of
the tree so from that little bit of
phasing you can scrap half of it already
so half the job is already there there
and that's from putting in the tree I'm
facing the matches so the importance of
this match is high as it's just above
two hundreds in centimorgans Isaac a
owner had an extensive tree with other
testers it fairs these cousins in so
there with the red female symbol and I
think that's extremely important to get
that knowledge out that it makes it very
useful for for working with trees so the
next step I looked at the chromosome
browser and it showed a very high x
matched look 218 centimorgans and now
we've got 128 on the X chromosome alone
now this definitely is something to
start getting interested in interested
in because the owners are I couldn't
show all the chromosomes on the screen
bull going through there's little bits
of segments going all the way back up to
one but on DX I just said wow look at
that
that's absolutely massive so this is the
part where I kind of walk through the
example of how how it worked it out as I
say the names are all changed but the
outcome is the same
so we've got a family tree and down at
the bottom we've got a lord of people
with DNA of symbols beside them so we've
got this Smith family and we've got this
Baker family and as you can see the
Smith family have done DNA testing and
the Baker family have done DNA testing
and they all are descendants from
georgina Clark or John Baker up here yes
so then what happens we get our new
cousin appears with the 218 centimorgans
the 218 centimorgans matching with and
that's where the match is with this
person here so we're saying right this
new cousin how do they relate because
they haven't got any information and
they don't know how they relate to this
person because they're contacted and
it's in one of my research projects and
they were adopted so they don't know how
they managed to fit in so right the
first thing I needed to look at was what
are the lines of that lead that that the
new cousin could match on so firstly
from Anne Smith I went up and I said
right Joseph Smith I've ignored
why have I ignored him I've ignored him
because there was a female symbol from
the phasing of the day so I said right I
can discard that side of the tree
it's definitely with that we're on this
side and because the segments were long
enough I was quite confident then that
this was definitely on this site so I
looked at the possible family tree
coming down from Michael Clarke and Anne
Miller and James Baker and Anastacia
Cartwright so I said they're all of the
descendants coming down right um so if I
then went along and had a look and said
right well we've got these cousins these
first cousins of Anton and
over here is it the first cousins right
so they are also descendant of these up
at the very top of the tree so that was
starting to make me think right this new
cousin has got to be a descendant of
either Michael Clarke or Anne Miller or
James Baker anastasiya Cartwright and I
can make that assumption at that level
because of the level of DNA being a
second cousin at two hundred and
eighteen centimorgan so it's not really
going to go much farther back so the
next thing ah the new cousin got some
information and found the mother's name
was Clark so haha we then start to look
here and we say right so we've got
Michael Clark and Anna Miller so down we
come so I put in a few more settings for
Georgina Clark in here Michael Clark and
Annabelle Clark and then we've got some
unknown in Clark here the two represents
two generations there's two generations
needs to fit in here to me put them in
the right place and then we said alright
so we can place the cousin in here
because we can see the Clark coming down
but if not life is never that simple the
problem solved the new cousin is
descended from my Clark and Anna Miller
well maybe not the problem was the X DNA
only matched with those Smith causes so
look we have the Baker's DNA match
nothing
Smith X match nothing nothing and here
is the one we've seen earlier that 219
with the 42 so I said mmm there's
something wrong there so if we got back
a couple of slides that means that all
of these guys are not passing the X down
so if I go back up here and have a look
right that means then that the DNA from
here from georgina Clark would come down
to these so it can't really be the X DNA
from John from georgina it must be
from John because here we got an Baker
receiving our X DNA from her father but
we have James Baker over here not
receiving the X DNA from her from the
father because he's got the way from so
then it made me go back and think mmm
right we've got a new little problem
here to solve so let's see where we do I
went and looked at the X inheritance
from Georgina Clarke
so from Georgina coming down we've got
all of these here and so they would
match with the X you know is that M
Martin Baker over at the edge he is not
dotted because he is not got the X
chromosome from the father from James
Baker so it gives you a little bit of a
limit but you can see mmm that's a
problem and if it was from the Clarkes
and there would have the X match so
let's go on another little bit right the
X chromosome from John Baker he passes
the DNA to his daughters from his first
and second marriage so here we've got
the focus of the X now has got to be
true John Baker and from his mother
anastasiya Cartwright so down to an
Baker and look the Smiths
families again they have got the the X
DNA in here but if it's coming from here
that's correct the Baker's over here
that we saw in the last light with the
tree of the Pavin doors tree not having
any X is exactly as we would expect but
John Baker had two wives because his
first wife died after about 20 years of
marriage and then he married Georgina
Clarke so from his first wife Elizabeth
Chandler well they had some children and
of course Isabelle Baker and Elizabeth
Baker are a half-sister of an Baker so
they would therefore be carrying the X
chromosome down of John Baker Isabelle
Annie
a bit baker now it is a bit Baker we
know went to the United States and her
husband died tragically young so they
did not have any children and there's no
record of any and she lived to be 91
years of age so we knew that there was
no children there so look at here Clark
Isabel byaku Merida Clarke just like
Georgina's name up here and that was
thought true the research out for a
month or two until I really started one
Sunday morning starting to re-examine
the whole DNA because we were assuming
because the Clarke was here that it was
going back to Georgina Clarke and you
see this is where you might think all
the cernium is going to actually give me
the answer this is where I want to look
and it isn't at all there's a lot of
names in Ireland where basically you
have Lords of people marry with Marian
like a my great-great-great grandparents
level I've gotten all and Marian and all
and neither tomorrow they at but doesn't
all and Marian and Norland so you can
see where where you end up with this
kind of thing that control you out and
distract you of it so we're nearly get
into the end of how this little mystery
was solved so the new cousin descends
from James Clark and Isabel Baker and
further matching with descendants from
James Baker and anastasiya Cartwright
confirms this hypothesis because I
couldn't have a tree I go all the way
across the whole room bringing in
American cousins numerous American
cousins and everything but I was able to
do a little bit further more research on
this to confirm so you can see then that
a match with Anne Smith and this and and
Neil Smith bridges on this line which
were shown as the to Smith's they're
actually matching and with Isabelle
Baker and then coming down from the
Clark line here so from here I do know
which one of these is but are not going
to go
to that because as I said it's it's
better chilled to leave it because at
this line here then when we get into the
one where that person is still living so
that person is the mother of the new
cousin but we now know who the new
cousins grandparents are great
grandparents great great great great
great backup and we know exactly how
that cousin relates to Anne Smith so
that's just a kind of a little simple
exercise on how the X chromosome has got
a different inheritance pattern how the
how D X has got a different inheritance
pattern and also how you can be mislead
by surnames like because James Clark had
the same name as georgina car and how
you can end up being going down a blind
alley but one of the big things to
remember is the amount of DNA that Anne
Smith has because she got our DNA from
our mother but then she got her mother
got it from her father John and she got
a whole X chromosome coming down on
recombined so she got anastasiya
Cartwright's DNA straight down unchanged
and then it would have been some
recombination here would that still
allowed for a manner
anastasiya cartwright piece of DNA all
the way down because it didn't get
recombined here
it was just passed on directly down
through John Baker right down to an
Baker so an Baker ends up with more or
less the same X chromosome as Anna
stairs the account right because there's
no recombination in the mail and that is
why you're such a long segment and the
same thing happening coming down here
and characterized essentially got the
same DNA segments as Isobel beggar of
course and both of doors should have a
very similar if not the same because as
I say there's no recombination that's
what's being passed over and that's why
coming down here even though you're
going back up quite a few generations
you've got such a long segment and I
think that's if there's one takeaway
from the presentation is
remember about how it goes through the
mayor line on change so you can get back
you could very quickly end up with large
segments that are like a hundred hundred
years or more apart and it really it
really brings it together so I hope that
part of the presentation is kind of
giving you an idea but I have two more
slides that I just want to finish with
and that's about just DNA kids and
profiles and good practice because I
could not have solved any of this
information if there wasn't trees there
if there wasn't some information in
terms of phasing on the kids because if
it was fair it wasn't fair so I could
have worked it out in the end but I
would have been working on the parental
line of Anne Smith as well so it would
have doubled the work twice the length
of time and it really narrows it down so
what I recommend to everyone is create
and a pedigree tree back as far as
possible but I've invented if someone
else hasn't before me so hopefully I'm
not plagiarizing the great-grandparents
rule and I think if people were to look
at the trees and get to the
great-grandparents and put in as much
information as you can on that level in
births marriages deaths any information
newspaper articles attach them all to
the tree and you with having air
great-grandparents it gives a lot of
names and most of them will be back
before the 1911 census for example my
great-grandparents were born between
1858 1975 so quite a long time ago and
I'm sorry 1880 in 58 a May and that
means that all of the information is
searchable so if you are looking for
somebody and you can at least have a
tree with your great-grandparents going
back or as much information it gives
people being able to look at that and
look at public records as well and then
they can say oh one of their
great-grandparents are one of their
siblings have related to me and it can
give people an opening into how you
might be related and it covers for
privacy for people who may be the
grandparents if you like are still alive
and the
for people that are younger if the door
want to put that information in for
privacy of living relatives or maybe
some relatives are not too happy if you
go back to the great-grandparents and do
it and of course doing it at the
great-grandparents level it gives you a
wider number of names to work with as
well which always makes it better and
develop a tree farther back if possible
from your great-grandparents and if
we're EVC reason you cannot do the above
please for an or and your profile
inviting contacts they can't you contact
you and I think probably everybody in
this room does this put its other people
it's about us as genealogists helping
other people that just do DNA tests
maybe people just do DNA tests for
ethnicity purposes or for interest sake
it's trying to get them to put some of
the basic stuff in there and I've with
ancestry try to explain to people how to
link the basic tree and I've created
little jet coms and sent them to people
to pull on their site so they don't have
to do anything just upload the gedcom
and it's there and for people that I
know and I just think do not as
genealogists we're going to help really
make huge breakthroughs with DNA if we
can get an equal to put in information
so great-grandparents rule and the last
one is use the great-grandparents
alternately use the grandparents and it
protects connect your profile true lines
function then works correctly in
ancestry if you get that in you can get
your true lines function start to work
in ancestry the smart matches in my
heritage will work and defacing
especially in Family Tree DNA and the
great thing about Family Tree DNA is the
fact that you can phase without your
parents you can use cousins you can't
use siblings but an aunt or an uncle
first cousins second cousins first
cousins once removed are excellent for
phasing and the more you can put in the
more segments will be there so the more
phasing matches you will get and enter
the ancestry info oh that's the other
thing I just wanted to mention there's a
beta function in family search in family
23andme
that connects to family search and I
spend
all of my Christmas holidays update and
all my family tree on Family Search and
linking it in to 23andme so it's now a
lot of people might not know what's
there but if you got 23andme account if
you go in and find the link you can turn
on the beta and then if you go into
family search and put yourself into
family search in an account and try and
link it back to maybe if there's some
tree there or pour a bit of a tree and
link it in to fund into 23andme you can
actually click and go directly into that
tree for other people can click and I
think I've only got six matches that
I've connected with a beta families a
beta for family search but because
family search of courses is run by the
Church of Jesus Christ Latter day stairs
the Mormons in Utah is free there's no
charge for having a family search
account and it's one single global tree
so I definitely for people that are not
aware and have 23 tested be 23andme have
a look at that feature in the beta it's
it's really really good and that is just
a diagram to show and where if you put
in as much information on your
great-grandparents how it's going to
help you then follow solve many
mysteries and walk it through and I just
put up a couple of references because
the family tree guide to DNA testing and
genetic genealogy by Blair Bettinger a
great book I've used it and a lot as
chapters on X DNA Y DNA really good
source to do and then for people who
have tested with Family Tree DNA if
you're not aware there is a document you
can download I think it about 42 pages
long about genetic genealogy tests and
Family Tree DNA so there's another book
and then there's an advanced genetic
genealogy techniques and case studies
that's a very big book little bit more
advanced but deli kena in the audience
down here is written one of the chapters
and it's really good for getting into
more information and again here we have
some of the some of the references and
then johnny is speaking later on DNA pet
as well so and I think that is a nearly
it thank you
DNA extremely valuable toolbox X
chromosome is often neglected carefully
Reese careful research and application
of the X chromosome can break down Wars
and solve many family mysteries and to
use DNA effectively accounts must be set
up correctly so I hope you liked my
little first time doing a presentation
segment on the X chromosome and no
autosomal DNA shared at all is that that
can happen yes because what's happening
is that it's coming down from even
further back boy it if that happens it's
normally a male female male female
because it's brick there's only then
recombination happening in every other
generation so if you get that you
probably want to say write the person's
great-grandfather is probably coming on
that line and then it'll go back to
their great-great grandmother and then
it would be their great-great
great-grandfather because for that to
happen it's thinking about it on the if
it was female female female it would
recombine at every generation and then
it wouldn't be so that's kind of giving
you a few tips of if that happens it's
skipping the generations well you're
going to be around for the rest of my
window yeah so if anybody has any
questions for Martin about their X
chromosome please don't hesitate to
contact them we're running a little bit
short of time so we have to cut it there
but please give a warm thank you mark