GENEALOGY-DNA-L Archives

Archiver > GENEALOGY-DNA > 2010-03 > 1269797206


From: John Carr <>
Subject: Re: [DNA] 23andme cousin results
Date: Sun, 28 Mar 2010 10:31:23 -0700
References: <CCC182DA-E426-430A-BA37-355BD4D5E8AD@earthlink.net><ea3bd9561003272128k3b567d83y190aeb937b77803b@mail.gmail.com><253CFBB8-15B8-4B84-81E5-A4F86DEEC8D7@earthlink.net><ea3bd9561003280921v52a58139o5e8c730e640c5c7f@mail.gmail.com><00d901cace95$a4b8bda0$5e82af48@Ken1>
In-Reply-To: <00d901cace95$a4b8bda0$5e82af48@Ken1>


FTDNA also only provides words, so they are saying 'trust me', rather than you can see in this data that ... . Might work as a sales tool, but useless for diagnostic analysis.

The answers to these questions about genome mitosis within a related group are probably in DNA studies conducted with simpler organisms, such as yeast. there are many papers out on yeast, fruit flys and other simple or short lived life.

Perhaps this male recombination bias David mentioned explains why parent to child shared results and sibling shared results are consistently around 84% rather than the 50% that is offered as the expected shared result.


On Mar 28, 2010, at 9:42 AM, Ken Nordtvedt wrote:

> ---- Original Message -----
> From: "David Faux" <>
>
>> The two charts provided by FTDNA on the FAQ page for their Family Finder
>> are
>> extremely helpful in understanding complexities such as how much a thrid
>> cousin twice removed "should" share with you. They are found here:
>> http://www.familytreedna.com/faq/answers/17.aspx

>> One factor which I have not seen addressed though is the reported female to
>> male ratio of 1.6 to 1 in terms of recombination rate.
>
>
> By any chance did FTDNA include the statistical confidence intervals, or
> better yet the actual distribution of relationships relative probabilities,
> for the various levels of sharing?
>
> That would be useful information.
>
>
>
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