GENEALOGY-DNA-L ArchivesArchiver > GENEALOGY-DNA > 2011-02 > 1297556538
From: Ann Turner <>
Subject: Re: [DNA] x chromosome puzzle
Date: Sat, 12 Feb 2011 16:22:18 -0800
I presume they used the same method they did for the autosomes: generate
artificial pedigrees (descendencies) with real genotype data from the
customer pool. Randomly recombine the segments for each succeeding
generation. Then select a threshold for different levels so that most (95%?)
of the shared segments can be traced back through the pedigree.
On Sat, Feb 12, 2011 at 2:03 PM, Kathy Johnston <> wrote:
> I don't see how 23andMe can predict 4th cousins on the X chromosome with
> any degree of accuracy.
> Kathy J.