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Archiver > GENEALOGY-DNA > 2004-09 > 1096035377


From: Doug McDonald <>
Subject: Re: [DNA] SNP Testing - An R1a Surprise
Date: Fri, 24 Sep 2004 09:16:18 -0500
References: <b8.632cd79f.2e8537a9@aol.com>
In-Reply-To: <b8.632cd79f.2e8537a9@aol.com>


wrote:

>
>
> Huh! Did FTDNA test more than one SNP in this case?


yes
>
> Back mutations "should" be extremely rare,

Uh, no, at least in this case. There is already a
parallel or back mutation in the marker in question,
SRY10831. The standard charts show a back mutation, such that
haplogroup A is the ancestral state and all others except R1a are
the derived state. I assume without checking that this is becuase
chimps are at the same state as A and R1a. However, without knowing
that the common ancestor was this state, it could be a triple
parallel mutation (A, R1a, and chimps). Of course, if chimps
are and have always been the same as B-Q in humans, it is a parallel
mutation in A and R1a.

But it already is a multiple mutation, so this is a hot spot.

Doug McDonald

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