GENEALOGY-DNA-L ArchivesArchiver > 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
> Huh! Did FTDNA test more than one SNP in this case?
> 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.