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Archiver > GENEALOGY-DNA > 2009-08 > 1250002407


From: "Ken Nordtvedt" <>
Subject: Re: [DNA] Y-chromosomes of Jewish priests (2009 paper)
Date: Tue, 11 Aug 2009 08:53:30 -0600
References: <f3f05ce80908110327u5062ccb3g8bb2c2a4325a2fe6@mail.gmail.com><4A817271.3030901@scs.uiuc.edu><ea3bd9560908110743h40a3dac2v193ba708db42931b@mail.gmail.com>


----- Original Message -----
From: "David Faux" <>


> When Dr. Hammer published a figure of 18,000 years or so as the "age" of
> R1
> the vast majority here were jazzed because it better conformed to their
> preconceptions than anything in print to that time. The fact is that
> since
> the publication of the YCC update there have been numerous
> phylogenetically
> significant SNPs discovered and which will need to be added to the count
> and
> hence the date via this methodology will be pushed back a considerable way
> in time. R1 is likely much older than stated in their earlier paper and
> brings us more solidly within Paleolithic times.

The above shows a major misunderstanding of the SNP count method of finding
relative age lengths of tree branch segments.

The 18,000 year figure was based on snp counts seen in a particular fraction
of the y --- not the whole y. And then it was calibrated to an assumed
70,000 year old holy event and the sum of counts to that node.

The numerous snps found since would be from additional fractions of the y
examined, so of course the snp count for the various branch segments would
increase. Ken



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