GENEALOGY-DNA-L ArchivesArchiver > GENEALOGY-DNA > 2011-11 > 1320889037
From: Terry <>
Subject: Re: [DNA] IBD segment common ancestor age calculation
Date: Thu, 10 Nov 2011 12:37:17 +1100
The table does appear to say that if two people have a tMRCA of say 4
generations, then they are likely to have an average size block of 9 cM in
common. Is that an unreasonable number? Perhaps the table is quoted wrong.
Or perhaps the reverse statement is not true.
On Thu, Nov 10, 2011 at 11:57 AM, Paul Wright <>wrote:
> If anyone thinks MOST 5 cM autosomal matches are related within 7
> generations and 9 cM matches are within 4 generations, they are most likely
> On Wed, Nov 9, 2011 at 6:14 PM, Terry <> wrote:
> > Anders,
> > In CeCe's blog on the Family Tree DNA's Conference on Genetic Genealogy -
> > see
> > there is quoted a table by Bruce Walsh, that says amongst other things,
> > that a 5 cM match between two people would likely correspond to a 7
> > generations ago TMRCA, and a 9 cM match would likely correspond to a 4
> > generations ago TMRCA etc.
> > Not certain if that is what you were asking.
> > Terry
|Re: [DNA] IBD segment common ancestor age calculation by Terry <>|