Archiver > GENEALOGY-DNA > 2010-02 > 1265658821

From: "Charles Acree" <>
Subject: Re: [DNA] Y STR Partial Repeats
Date: Mon, 8 Feb 2010 13:53:41 -0600

Ken - I haven't communicated with SMGF personally on this issue. SMGF has posted statistics on the Y-Chromosome Marker Details page of its website for everyone to see. Details are displayed for both DYS385a and DYS385b, which show two apparently-independent "grand totals" of 33,053 and 66,106 samples respectively. I was discussing the latter, where 29/66106=0.00044 - the rounded frequency that SMGF shows for 13.2 at DYS385b. But your observation is correct. The latter figure is precisely twice the former, which is unexplained. Charles

Message: 3
Date: Mon, 8 Feb 2010 09:50:18 -0700
From: "Ken Nordtvedt" <>
Subject: Re: [DNA] Y STR Partial Repeats
To: <>
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----- Original Message -----
From: "Charles Acree" <>
To: <>
Sent: Monday, February 08, 2010 9:00 AM
Subject: [DNA] Y STR Partial Repeats

> I've mentioned that the distinguishing partial repeat in our Acree project
> (all tested by the Sorenson lab) is 13.2 at DYS385b. SMGF, in providing
> Marker Details within its Y-Chromosome data base, currently reports that
> the 13.2 value at DYS385b has been observed 29 times within 66,106 samples
> tested, for a frequency of 0.00044.

So SMGF has confirmed to you that they were recording partial repeats for
the entire period they were collecting those 66,106 samples?

That's interesting in that 66,000 is double the 33,000 which is the usual
number of samples they quote. Are they multiplying by 2 because of the two
copies of 385?
So always the partial repeat of 13.2 came with the other copy lower? This
sounds like the partial repeats were found within R1b.. or R1a... ?

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