Archiver > GENEALOGY-DNA > 2010-02 > 1265043298

From: "Sandy Paterson" <>
Subject: Re: [DNA] re GD vs TMRCA
Date: Mon, 1 Feb 2010 16:54:58 -0000
References: <20100201090210.PF9A3.561848.root@mp17><>
In-Reply-To: <>

Hi Vince

Am I correct in my understanding that the table suggests that for a TMRCA of
12, there is about a 70% probability that the gd is 5 or less?


-----Original Message-----
[mailto:] On Behalf Of Vincent Vizachero
Sent: 01 February 2010 16:03
Subject: Re: [DNA] re GD vs TMRCA

Several years back I made a table (through simulations) that gave an
idea of GD distribution for given levels of relatedness.


On Feb 1, 2010, at 9:02 AM, John Lerch wrote:

> You forgot to mention how many markers you were looking at. E.G. A
> distance of 4 in 1 generation for a 12 marker profile is absurd.
> Sandy P wrote
> Much work has been done on the estimation of TMRCA's between pairs of
> haplotypes but I've not come across anything that addresses the
> question of
> analysing genetic distances for given TMRCA's. That could simply be
> because
> I don't read very widely.
> Whatever the reason, for my own interest, as well as hopefully for the
> interest of anyone interested in deep genealogy, I've had a look at
> this.
> The idea is to address for example the following question : If two
> families
> are believed by traditional genealogy to have had a common ancestor
> say 30
> generations ago, what genetic distance would one expect today between
> members of the two different families?

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