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Archiver > GENBRIT > 2006-01 > 1137423776


From: "Todd A. Farmerie" <>
Subject: Re: Most recent common ancestors
Date: Mon, 16 Jan 2006 08:02:56 -0700
References: <1137338990.456458.231910@f14g2000cwb.googlegroups.com> <mo4ms15t5bs77ev0ds8bhs690882gdmb15@4ax.com> <dqf5c5$rl4$1@newsg1.svr.pol.co.uk> <dqff7p$afe$1@eeyore.INS.cwru.edu> <1137418196.188867.258490@g43g2000cwa.googlegroups.com>
In-Reply-To: <1137418196.188867.258490@g43g2000cwa.googlegroups.com>


wrote:

> Are there really such isolated populations? With nobody ever coming in
> from the next island, the next patch of forest, the next valley? Where?

No, but when you take into account the amount of time necessary for the
newly introduced line to reach saturation in the new population and the
time it took for it to have reached saturation in the neighboring
population the infusion is coming from, it becomes questionable that the
500 years since Columbus is sufficient to achieve complete European gene
flow into the most isolated South American tribes (many, yes, but all?).

In Europe, taking this into account simply bumps back the time to most
recent common ancestor. In the New World, you have a hard date beyond
which you cannot bump it without having to go _way_ back.

taf

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