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Archiver > GENEALOGY-DNA > 2006-08 > 1155303918


From: "Alfred A. Aburto Jr." <>
Subject: Re: [DNA] Matching
Date: Fri, 11 Aug 2006 06:45:18 -0700
References: <4f8.450dc47.320d428e@aol.com> <019b01c6bcf4$b2c47760$2878ebcf@12040>
In-Reply-To: <019b01c6bcf4$b2c47760$2878ebcf@12040>


> Ron Scott wrote:

> Ann,
>
> I'm not clear why mutation rates should be different outside
> father-son rates. Please explain.
>
> Ron
>

Look at: http://nitro.biosci.arizona.edu/ftdna/TMRCA.html

FTDNA uses a standard mutation rate of 0.002 (mutations per generation)
and also a higher mutation rate of 0.004. Unfortunately FTDNA doesn't
always tell you if they are using the standard or higher mutation rate.
In the reference above look under the section on "mutations" and there
you will see a reference supporting their claim for using the higher
mutation rate (it gives a lower bound basically)...
Al --- not Ann :-)


> ----- Original Message ----- From: <>
> To: <>
> Sent: Thursday, August 10, 2006 9:16 PM
> Subject: Re: [DNA] Matching
>
>
>> In a message dated 8/10/2006 1:02:04 PM Pacific Daylight Time,
>> writes:
>>
>>> See: http://www.familytreedna.com/trs_explain.html
>>>
>>> In a nutshell though it means these two people had a common ancestor
>>> within approximately 7 generations ago (95% probability).
>>
>>
>> That table is based on a mutation rate that is about double what
>> father/son
>> studies show, so personally I'd double the number of generations.
>> However, I
>> still think a 37/37 match is worth a modicum of effort to look for any
>> commonalities in time frame / location. As others have mentioned,
>> there might be some
>> additional clues. Does one surname have lots of good matches within the
>> project? Then the other surname might be due to misattributed
>> paternity somewhere
>> along the line. Is the haplotype rare? Then a match is more
>> "interesting." As you
>> noted in another message, the rarity of the haplotype doesn't impact the
>> TMRCA calculations, which are based purely on the behavior of random
>> events, but
>> it does influence my willingness to do some research.
>>
>> Ann Turner
>

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