GENEALOGY-DNA-L Archives

Archiver > GENEALOGY-DNA > 2007-07 > 1183399043


From: "Joe Knapp" <>
Subject: Re: [DNA] Help please with marker 458
Date: Mon, 2 Jul 2007 13:57:23 -0400
References: <cb5.149a70fd.33b919b0@aol.com><BAEKIPDCJKIGDOPBOCPBGEMPCPAA.r.bootle@btinternet.com>
In-Reply-To: <BAEKIPDCJKIGDOPBOCPBGEMPCPAA.r.bootle@btinternet.com>


On 7/2/07, Bob Bootle <> wrote:
> ( I thought the controlled-random example of the model would be more
> instructive initially than the irregular real-life examples ).

If it wasn't irregular, it wouldn't be a good model of real life. ;)

But there are controllable parameters at least. One I find instructive
is to first take two populations with no interbreeding between them
and note how the average genetic distance increases between the
populations, which it will. Then if even a very small amount of
interbreeding is allowed (say 1%) the average genetic distance between
the two collapses to very close to zero.

I saw a paper somewhere that described a similar result, where if
there are two populations A and B, each with a distinct haplotype, and
there is an occasional migrant from A to B (and never vice versa),
inevitably the haplotype of A will replace the haplogroup of B
completely. Diploid genes of B however will reach a steady state at a
non-zero percentage.

Joe

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