GENEALOGY-DNA-L Archives

Archiver > GENEALOGY-DNA > 2008-12 > 1230021240


From: "David Faux" <>
Subject: Re: [DNA] Trying to better understand the X chromosome
Date: Tue, 23 Dec 2008 00:34:00 -0800
References: <438122.81886.qm@web33404.mail.mud.yahoo.com><ea3bd9560812221542r7ef8cc00kf831d0e5ca9525a9@mail.gmail.com>
In-Reply-To: <ea3bd9560812221542r7ef8cc00kf831d0e5ca9525a9@mail.gmail.com>


Peter:

I updated the pdf noted below.

In addition there is a new article out which is summarized on Dienekes's
blog:

http://dienekes.blogspot.com/2008/12/x-chromosome-diversity-in-africans-and.html

David K. Faux.

On 12/22/08, David Faux <> wrote:
>
> Peter:
>
> Many of us are now trying to grasp the essentials of the way the "X
> works". I have found out a great deal more in the last few days that allow
> me to predict how much of each ancestor is likely to "be found" in my X
> (probability only with large confidence intervals - except for two very
> stable regions), and how much I likely passed on to my daughter's daughter.
> Here is a preliminary reading list:
>
> http://davidkfaux.org/X_CHROMOSOME_Haploblock_Resources.pdf
>
> A couple of the best articles will be added in the next day or two,
> including two that will answer the question Anders posed about the stability
> of the centromere (circa 60 Mb from the tip of the p arm), but also another
> region about half way down the extent of the X at 80 Mb - significantly
> fewer crossovers in these two regions. More specifics on this later
> including the number of SNPs decodeme and 23andme test in these relatively
> stable regions.
>
> David K. Faux.
>
>
> On 12/22/08, Peter J. Roberts <> wrote:
>>
>> A male inherits one of his mother's two X chromosomes. The mother got
>> one X from her father and one X from her mother. While the mother had those
>> two X's, they swapped some portions/blocks. Do we know how big those
>> portions usually are and how many portions usually get traded? Do you know
>> where I can find a simple answer?
>>
>>
>> Thanks and sincerely, Peter
>>
>>
>>
>> Peter J. Roberts
>>
>>


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