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Archiver > GENEALOGY-DNA > 2007-10 > 1191268741


From: Gabriela Novak <>
Subject: Re: [DNA] East Anglia and the Vikings
Date: Mon, 1 Oct 2007 15:59:01 -0400
References: <KHEKIJEABJGJEKDPFEDMEEGEEGAA.Elizabethod@eircom.net>
In-Reply-To: <KHEKIJEABJGJEKDPFEDMEEGEEGAA.Elizabethod@eircom.net>


I am not sure if you would find this useful, but I like the Y-utility
program. Maybe someone could comment on this.
http://www.mymcgee.com/tools/yutility.html
Gabriela

On 1-Oct-07, at 3:49 PM, Elizabeth O'Donoghue wrote:

> John Chandler said:
>
> 'There is practically no difference in the
> estimated TMRCA due to the differences of marker mutation rates...
> Mathematically, the only really
> significant factor is the *sum* of the mutation rates of all markers
> considered, whether they mutatated or not.'
>
> ---------------------------------------------------
>
> John, I've seen you and probably others make this statement
> periodically. I
> don't have the mathematical skills to easily test what difference
> there is
> between TMRCA based on 'slow' vs fast' markers, but Family Tree
> does set
> their calculator to take into account the varying mutation rates of
> each
> marker when comparing individuals. I have seen where the GD of two
> individuals varies, even if they have the same genetic distance but at
> different markers. On occasion, I've seen a closer TMRCA for two
> individuals with a greater genetic distance than two with a lesser
> distance
> (granted it's usually just a difference of one). And it's not
> hundreds of
> years, but it could be more than a hundred, even within a
> genealogical time
> frame.
>
> I know you discount Family Tree's mutation rates altogether, but the
> principle should be the same, regardless of the specific rates used,
> shouldn't it?
>
> Also, I know you responded to me a bit ago mentioning a 500-1000
> year scale
> for using your own rates with 'fudge factors'. Could you see them
> being
> stretched to 2,000 years?
>
> Thanks much. Elizabeth
>
>
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