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Archiver > GENEALOGY-DNA > 2011-02 > 1297642563


From: Ann Turner <>
Subject: Re: [DNA] x chromosome puzzle
Date: Sun, 13 Feb 2011 16:16:03 -0800
References: <8CD99D1DC315CDC-FB0-4EA9@Webmail-d115.sysops.aol.com>
In-Reply-To: <8CD99D1DC315CDC-FB0-4EA9@Webmail-d115.sysops.aol.com>


AFAIK, the pedigree simulations would keep track of the X chromosome
behavior as it passes through males and females. The simulations were
repeated 1,000,000 times, which gives a distribution of outcomes. We can't
know how the X traveled down the generations for any particular matching
pair, but that's a problem for autosomal inheritance, too. The recombination
rate is much higher for females than males, so the cM measure uses a
sex-averaged number.

Ann Turner

On Sun, Feb 13, 2011 at 12:15 PM, Kathy Johnston <> wrote:

>
> I wonder if 23andMe takes into account the unique inheritance of the X
> chromosome and if they count the smaller segments on the autosomes when
> making a prediction of cousinship for the X. I have noticed that
> mathematicians seem to like to combine information from both.
>

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