forget to subscribe so that you won't miss another episode of
try to it and go and try out Jed Match. See if you can see
and half siblings, put it in the comments below and we'll
looking for 100% no match and 100% half-match chromosomes and
find out about upcoming Econferences that we're
WWW dot Family History Fanatics. com so that you can
Family History Fanatics. Be sure to check out our website
uncles or nieces and nephews and your half siblings. Don't
the differences between your grandparents, your aunts and
questions about distinguishing between grandparents, aunts,
there are some grandparent relationships that look exactly
where they're located on the genome. If you have any
small segments on the interiors of chromosomes and then also
looking for. Looking for the number of segments looking for
can be separated out by using those three things to be
uncle relationships but the majority of those relationships
there's some half-sibling relationships that look like an
like some and uncle relationships and likewise,
looking at the 25 percent relationships to try to help
distinguish em. One key thing to always remember is that at
the extremes of these, there's going to be some overlap. So,
to possibly have those 100% unmatched or 100% half match
segments in their chromosomes than there are between a
the key characteristics that can help you distinguish
half match chromosomes in this case as looking we can see that
side of it is a really large segment and so that's one of
to remember some of the things that we saw with grandparents
with aunts and uncles and also with siblings so one of the
Nissan you. Any 100% unmatched or 100percent half-matched
chromosomes are usually only going to happen on the shorter
or are they on the shorter chrome because there's that
half-match chromosomes is are they on the longer chromosomes
of the segments we saw on the grandparent grandchild
going to look for any 100% half match chromosomes which would
chromosomes that none of them are either unmatched or a full
set of recombinations between the ant and the nephew, there
to be great, big, long ones. Well, because there's an extra
now it's possible that there's some overlap where a
relationship just because there's been more recombination
relationships share 25% of their DNA the same as with
throughout any of the chromosome. For instance, in
many as 10 or twelve of your chromosomes depending on your
that's a total of five chromosomes have been passed on
meaning that they're all gray or 100% half match meaning that
makes this significant is that chromosome number 7 is one of
the lower numbers so it's one of the longer chromosomes so
thing to look for is 100% unmatched chromosomes or 100%
first difference is is they're probably not going to be the
half sibling as opposed to one of the other 25% relationships.
looking at chromosome number one right here there is a small
segment right in the middle of the chromosome but on either
chromosome number seven is 100% half match chromosome now what
between half siblings and aunt uncle relationships the last
chromosomes. So, this is another indicator that it is a
with this full siblings but we will see many segments just
relationship second thing is is we're usually not going to see
expect to have unmatched or 100% half match chromosomes in
relationship two key differences here between the
Now, I've given you three things to look for when we're
aunt uncle relationship with those smaller segments the
gray segment which is about a third of the chromosome the we
your chromosomes. The second thing that we can look for is
the long chromosomes with siblings we would expect them
grandparent to grandchild relationship is going to be
grandparent and the grandchild half siblings the same way the
recombination event and so there's going to be many more
small segments stacked together so for instance if we're
with the aunt uncles now siblings each had a separate
like we saw with the aunt uncle to the niece nephew
we're not going to have any of that full match that we saw
only difference is is since they only share one parent
whereas aunt uncle relationships we would not
several of these short segments that are much smaller than any
really small segments that we saw in the aunt uncle
there's actually two chromosome number sixteen and chromosome
relationship from the grandparent relationship.
those three things help to distinguish the aunt- uncle
chromosome that they got from their common ancestor. Looking
Finally, the last relationship that is twenty-five percent are
at this set right here we can see in the first fifteen
relationship. As we look down through it, we actually see
half match. If we scroll down to the rest of it, we see that
half siblings and this one is a little bit trickier but we have
first things to look at is the number of segments just like
an aunt uncle relationship rather than a grandparent
thing that we're going to look at is we're going to look for
mean all blue and that would mean that in those chromosomes
the aunt and the niece or nephew share the same
among the shortest chromosomes that we have in our genome. So,
numbers. In this case, there's two of em and they both are
chromosomes and those are the chromosomes with the higher
you're going to look at is the number of segments and the size
relationship. So, those two indicators are the first things
any 100% unmatched chromosomes meaning all gray and we're
extra set of recombinations between an aunt, uncle, or the
of the segments on the interior of the chromosomes now the last
particular, we want to look for small segments that are
short and that's fine because of recombination but usually
that we're looking for with any of these no match or 100%
number twenty are 100% no matches. Now, the one thing
your segments on the interior of your chromosomes are going
shorter blue segment. So, this is an indication that this is
is a possibility for smaller segments and particularly small
segments stacked next to each other. If we look at chromosome
we ignore the end segment, the blue end segment, it's followed
more segments it is more likely to be an aunt uncle as opposed
actually close together. So, if you remember with grandparent
number one, we can actually see this right away. First off, if
by a short gray segment and right after that is an even
grandchildren, you could have segments on the end that are
aunt uncle relationships but for the most part if there are
for is we want to look for small interior segments and in
more segments than a grandparent grandchild
so the next relationship we want to look at is your aunts
to a grandparent grandchild the second thing we want to look
we want to be looking for is we want to be looking for the
length of the chromosome followed by another great big
grandparents but how that DNA looks at the chromosome level
and uncles or your nieces and nephews. Now, again, these
grandparent grandchild has a whole lot of recombinations and
another one that has been passed on to the child and
an aunt uncle doesn't have near as many as a lot of the other
completely unchanged from the grandparent to the grandchild
have been passed on to that child also chromosome# 12 is
number of segments. Now, aunt uncle relationships should have
grandparents, we can see more of these and these can be
uncle relationship and yourself. So, the first thing
is going to be different because there's been a
event and this happens in one or two or three, sometimes as
different number of recombinations between that and
were all 100% match across. Well, grandparents can pass on
they are all blue. Now, if you remember with parents and with
chromosomes to their grand kids if there was no recombination
identical twins, all of their chromosomes were all blue. They
chromosome 6 chromosome number nine are both full chromosomes
your end segments might be really short or they might be
we can look for chromosomes that are either 100% no match,
there's actually two more down below if we scroll down so
this grandparent child relationship we see that
lots of these great big segments on the interiors of
have that final end segment. Now, because of recombination,
moderately in length but the key characteristic for a
when you see this relationship is the recombination that's
parents and how many recombinations happen. So, in
beginning and then a big blue segment which is almost half
single chromosome and it's mostly going to be in the
longer chromosomes so we're looking at the big segments and
or two maybe three recombinations and only in rare
as you can see in chromosome# 1 we have a little segment at the
grandparent to a grandchild relationship. Now, what you see
cases are you going to have four more recombinations in a
the chromosomes swap different places before being passed on
relationships that we have in genetic genealogy. The first
recombine independently but most are only going to have one
relationship we're going to be looking at here is a
looks different. We're going to be using the Jed Match. com
big long chunks of the same DNA and by the same DNA I mean the
blue lines or the gray lines now each chromosome is going to
to the children so the way that we can tell that this is a
grandparent relationship is first off by looking for great
one-to-one comparison to look at the three25 percent
videos about our close relationships and how our DNA
happened in the or the father of that child and this is where
segment of DNA. This is a second in a series of three
Howdy, I'm Andy Lee with Family History Fanatics and this is a
apart just by looking at your chromosomes.
the same amount of DNA, doesn't mean that we can't tell you
all share 25% of your DNA. But just because you guys all share uncles, your nieces and nephews, and your half siblings
In genetic genealogy, your grandparents, your aunts and
going to be a part of.