why those cousins aren't showing up in your match list.
you know about and you're not seeing any matches from others
we'll try to answer them for you. Be sure to check out our
some of you, hopefully that explains a little bit more
and these lines might be five to six generations removed from
whether that is a false match. Now, as you can see from this
for when you're looking at your matches as a whole is if you're
you share DNA with are probably false matches and in many
find out about upcoming e-conferences that we're
have any questions as always, put em in the comments and
DNA, there are chance opportunities where we appear
to share DNA with other people but we're not actually related
detectable as a match. So, because humans share so much
about how we aren't related to all of our ancestors. If you
from those third grade, fourth grade grandparents and that's
you. It just maybe that you actually didn't inherit any DNA
matches. So, below about. 2% of shared DNA it's really
seeing lots of matches from just a few certain lines that
in the tenth generation. So, one thing that you can use this
10 centimorgans. So, below that, a lot of the people that
into the interesting part. This fourth column is the number of
the number of direct ancestors that you have in that
is the maximum amount of DNA that we actually see in that
the fifth generation, the number of ancestors starts
you can understand what it is showing. This first column is
your tree just because of the randomness of how DNA is
than 4% of DNA. This can make finding different cousins
of our ancestors in those generations. Now, the last
this out further to ten generations in order to create
transferred down through the generations. Now, I extended
DNA with and of course then the next column is the number that
should share about one point five, 1. 6% of our DNA with
genome but it has preferences for certain areas and so
certain chunks of DNA tend to get passed down through the
generation, we also see a couple of interesting things.
that you share DNA with and by the eighth generation, it's
little bit each time and the amount of DNA that you get from
like you are actually second cousins as opposed to fourth
point1% and sometimes as much as 4% or even a little bit more
grandparents, the sixth great grandparents, we share between
generation, the average is approximately half but also
eighth generation and the same rules apply where each
half percent. This puts us on the road to having some of our
next step in the computer model extends us out from fifth to
grandparent, it's much more likely now that from your great
based on a probability distribution and so the
share any DNA with so still For those that we do share, we
them but what you can see from the model is that for those
grandparents, we don't share any DNA with. Now, the second
expect to share about. 4% of DNA with each one of our
actually increases because we're related to less and less
cases, there's more false matches than there are true
I'm running simulations about every second. Now, you always
numbers never exceed a hundred and 20 ancestors per generation
marked that in red. So, you can see in the seventh generation,
it's just a little more than half of all the grandparents
website WWW dot Family History Fanatics. com so that you can
model that I've created as the simulations go through, the
great grandparents or great great great grandparents that
difficult to determine whether or not that is a true match or
I hope you enjoyed seeing this computer simulation and for
average, you share approximately 25 percent of DNA
generation. So, it also doubles each generation. Now, we get
your DNA from that same great grandparent. That would look
get 50% of your autosomal DNA from each parent because they
you share some DNA with. You can see that once you get to
three columns are important because it's looking at the
each generation. Now, this combination is not totally
amount of DNA you share with people that is really
that range that that could be over actually increases a
generation based on the simulation. The third column is
closer and closer to zero. In the sixth generation for sure
having amount of DNA each generation, what we're doing
this table here. Let me go through each of the column so
ancestors drop out completely from our DNA profile. Now, the
those ancestors in that generation that you share zero
any DNA with. Now, as I extend this out to the ninth
this means is in those instances, there are great
random and it follows some averages. For instance, on
having your DNA each generation. The second column
the average amount of DNA that you would expect based on
to them. Now, this range is usually somewhere around 7 to
dropping off and as you go up, that decrease in percentage
and sometimes in the fifth generation, the tail ends of
much smaller than the thousands of ancestors that we do have.
generations so in the ninth generation on average we would
recombination and other factors that go into how DNA is
and these cluster around 12 and a/ 2%. but again over a range
is is that recombination can happen to anywhere along the
less than the average of 25% let's say 20 from a
20 ancestors in any given generation. Well, that may not
segment of DNA. Now, I need to come clean. I've told you
First off, about three quarters of our sixth grade
grandparents from your father or your mother do add up to
cousins and so you may be looking in the wrong part of
see you don't get exactly 25% from each one. However, the two
actually less than half of all the grandparents that you share
DNA that you got from the great great grandparent. Now, by
confusing. Say for instance, you and a cousin share 4% of
ancestors however like I said three quartersome we don't
of values you can also see that each set of great grandparents
adds up to what the grandparent was so if you received much
give you a full set of chromosomes. So, that part
you don't inherit any DNA from. On my computer model, I've
that probability curve are actually less than zero. What
with that probability curve is we're actually shifting that
majority of people cluster around numbers close to 25% now
two great great grandparents has to add up to the amount of
that 50% of DNA that you got from your parent. Now, this is
never changes but when it comes to your grandparents, you can
grandparents, you're going to inherit much less than 12 and a
the first part of the computer model. Now, in it, you can see
when it's larger or smaller. So, this helps us to understand
the next generation as you can see is your great grandparents
that range is somewhere between 20% and 30%. Usually, except
with each one of your grandparents but in actuality,
transmitted down through the generations but the number is
to estimate roughly how many it could be based off of
evidence to show what it is. We have to rely on computer models
What we do know is that our autozonal DNA recombines with
before that you're not related to any more than a hundred and
around. I've done several videos about how we're related
to 1 20 ancestors in any given generation but today, I've got
a computer model to show you.
be true. That's because we really don't have the empirical concept for a lot of genealogist to wrap their head
We don't share DNA with all of our ancestors and that's a hard
going to be a part of.
Howdy, I'm Andy Lee with Family History Fanatics and this is a