DNA tools are great and there's actually been many tools that have come out this year.
One of which I want to go over today and show you how it can be really useful.
So, this is the Shared CM Tool which many of you are familiar with. Except now,
you can use two people instead of just one to help narrow down your search.
So, the tool can be found on the DNAPainter.com website.
If you just go to tools, there's going to be a list.
And it is the first one on here the Shared CM Tool.
And you'll notice here it has,"hey, we can go to the new version where you can enter two values!"
Let's start with just clicking on the tool and just entering
one value to see a couple of different things to make sure we can see how this is working.
So, I'm going to use siblings, because I happen to have my DNA for my siblings.
And I looked at several matches. So, here's this first one
where I shared 393 centimorgans. And on this you can see that,"hey,
it comes up and says there's a 73 chance it is one of these and that is the
great-great-aunt, half great-aunt,
half great-niece, great-great-niece.
That's nice. My brother happens to share 484.
You'll notice that,"hey, this changed!" Instead of 73, it's now 89 chance
that it is one of these. Likewise then the others change.
So, for instance this is only a 7% chance that it's the half great-niece.
Whereas with mine, it was a 27% chance. So, significantly more.
And then, finally I had this about 0% chance it's these other two,
which is completely different from my brothers which is 4% chance that it's one of these others.
And so, wouldn't it be great to actually be able to combine these
two to eliminate some of these possibilities?
Well, that is what this new version does. And over here,
you can see on the other version, there's this new- with the option to add a second amount.
I'm going to click on that.
Now, you'll notice that this looks similar to the first page,
except that there is two boxes here to put something in.
So, you can see here that there are two boxes to enter information in.
I'm going to start with mine- 393.
Now, you'll notice- it didn't come up with the probability table.
But it does come up with the map of different relationships.
And you can see all of these here are possibilities with 393 centimorgans.
Well now, what I can do is I can put in my brother's 484.
And let's see how this changes. Now, if you're looking carefully,
you'll see that actually this has disappeared off of it.
This has disappeared off of it.
And I think this has disappeared off of it. In other words, it is taken out of possibility
those relationships which don't meet both of our DNA.
Now, this is somewhat similar to what WATO does, except this only does it for two.
And this is showing you a lot of the possibilities in this nice chart format.
And it's not just with these big ones.
So, let's just go and let's change this up a bit.
I'm gonna clear these and we'll start with another match.
Now, I shared 298.
Now, you'll notice all these are possibilities with 298.
Well, my brother shared 280. And if I do 280, you'll notice
that nothing is actually changed here. And that's just because 298 and 280 are so
close together that really all the possibilities for one are the same possibilities for the other.
So, one thing I would say, whenever you're using this tool, is try to use it only for
matches where there is a somewhat of a disparity between you and your sibling.
So, let me go to my next match here.
I happen to have 209 I shared, you know, quite a bit.
And look at all of those that are at 209. Well my brother, only shared 93.
When I look at that, there have been quite a few that are eliminated as far as possibilities.
So, again we're just using shared DNA from two
brothers and how that affects which ones we need to look at.
Let's do another example. Here I share 140 with one match, and there's..
As you get lower in numbers, the number of matches possible for
the number of relationships possible increases. Which makes this tool important, because I can put
in what my brother shares here which is only 59. And you can see it has eliminated some of those.
So, it's not necessarily eliminated a lot or half but it's eliminated several.
Now, we might use some age deduction to guess
that,"hey, it's not going to be two generations or more older than us."
So, I could eliminate these ones right here.
And it's not going to be two generations or more younger than us.
So, I could eliminate those right there.
So, I'm left with these few right here in the middle for this.
But the other thing that you can do with this,
is really any two matches that are along the same generation.
So, for instance, let me take a look at me and my first cousin- a couple of different matches.
We'll do a match I share 365 with and he happens to share 347.
Now, there hasn't been much change here.
But this is where it's important, When you know what relationship you're looking at to see.
So, for instance, I'm looking at myself plus a first cousin here.
Our second cousins are going to all be second cousins to me and my first cousin. Okay.
But first cousins once removed, well, that's going to actually, obviously,
eliminate any of his children. Necause he wouldn't be a first
cousin once removed with them, but only with other first cousins.
So, it would also eliminate his siblings- okay? So, it's not going to be nieces
and nephews of him. So, they're my first
cousin once removed or my niece or nephew. They're not going to be part of this.
So, if you're using first cousins, that's usually pretty easy to keep straight.
Once you get to second cousins, that's going to be a little bit more difficult.
But you can still do it.
Let's look at a different match here. This is again with me and my first cousin.
I share 212 centimorgans and he shares 121 centimorgans.
Here's with just me- if I just had myself. But now, with him there's a few relationships that
have gone away because they don't fall into that set of what we expect from that relationship.
And again, this can go all the way down.
For instance, let me do this one of 133 for me- a lot of relationships there.
On this relation, this one he happens to share 267.
So, you can see it has 11 dominated some of those relationships.
So, this new tool or actually this addition to the tool on the Shared cM Project Tool is very useful.
Again you can use it with any two people who are on the same relationship plane.
And by that I mean your first cousin, your sibling,
your half-sibling, third cousin, fourth cousin. Anything along that you can use this tool for
to help isolate what relationships these unknown matches may be to both of you.
Now, I liken this tool to WATO. This is sort of like a really scaled down WATO,
because you can only put in two relationships.
Nut in a lot of cases, those two relationships, along with some other data- like how old that
match may be compared to you - might eliminate many of the possibilities.
So that, you know, where to focus your research.
Now, if you like this video on the Shared CM Tool,
then you can watch another video to learn how to use it more up here.
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