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Archiver > GENEALOGY-DNA > 2003-09 > 1062604516
From:
Subject: Re: [DNA] Need feedback with interpretation
Date: Wed, 3 Sep 2003 11:55:16 EDT
In a message dated 09/01/03 1:33:00 PM Pacific Daylight Time,
writes:
> I have 3 men in my PLATT DNA group who are a near match, same surname. I
> will
> call them A, B, and C. B and C are documented 3rd cousins twice removed.
> Their common ancestor was born in VA in 1794 and had 5 sons. B descends from
> the
> oldest son and C from the youngest. B and C are a 24/25 match with B having
> a 9
> and C a 10 on DYS 459b.
>
> A's ancestor emigrated from Ireland in 1844, but his line was probably from
> England earlier, as the family attended an Anglican church. A is a 24/25
> match
> with B and a 23/24 match with C. He has a 19 on DYS 458 while B and C have a
>
> 20. He has a 9 on 459b, matching with B but not with C.
>
> In the REO database the three have a single one-step mutation (12 marker)
> with someone from Great Britain, and that is the only near match they have.
>
> I have made the assumption that the three are probably related with A having
>
> the earliest DNA and C the latest. Any discussion of my conclusions and
> anything I may have missed would be greatly appreciated.
With three samples and no known common ancestor, you don't have quite enough
data to know which line has the oldest haplotype. Since you have two
independent lines with a 9 at 459b, the mutation probably occurred in C's line after
1794, but even that is not certain. If you find descendants of another son to
test who also have a 9, that would firm up the haplotype of Mr 1794.
Alternatively, you might find other branches descended from the youngest son of Mr 1794
who still have a 9, and you could zero in on a branching point in C's line.
Since the haplotype seems rather rare, I think there's a good chance that A
is related to B&C, but you don't know when. You also don't know if the common
ancestor of all three had a 19 or a 20 at DYS458, so you can't really say that
A has the earliest DNA. That might become clearer as you get more data, too.
I'd lean slightly in favor of 19 being the oldest, because it is closer to the
modal value of 17 for DYS458 in the ybase files. But when you're looking at
small samples, that's really speculative.
It's interesting that you and the Knotts seem to have higher values than
typical for DYS458. How do you compare with the rest of Knott's markers? And what
was your haplogroup?
Ann Turner - GENEALOGY-DNA List Administrator
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