GENEALOGY-DNA-L ArchivesArchiver > GENEALOGY-DNA > 2008-06 > 1212496439
From: "Ken Nordtvedt" <>
Subject: Re: [DNA] Correlation of Y-haplogroupsJ2and J1with Neolithicagro-pastoral economies
Date: Tue, 3 Jun 2008 06:33:59 -0600
I estimated when the single member of IJ who was the MRCA for I and J lived.
I took a population of J haplotypes and a population of I haplotypes and
determined the interclade variance between those two populations. Every I
to J haplotype comparison had to go through 2G(I,J) generations --- from the
present back to the I/J MRCA and then returning to the present. So this
interclade variance is actually more conceptually and mathematically related
to the pertinent age G(IJ) than would be MRCA age estimates for separate
clades. That G(I,J) age turned out to be about 23,000 years with its
appropriate statistical confidence interval.
----- Original Message -----
From: "Jackson Montgomery-Devoni" <>
Sent: Monday, June 02, 2008 10:47 PM
Subject: Re: [DNA] Correlation of Y-haplogroups J2and J1with
> Ken how did you estimate the age for IJ? Was it by comparing I and J
> haplotypes with surviving F haplotypes? Or? And you estimate IJ to be only
> around 23,000 years old?
>> From: > To: > Date: Mon,
>> 2 Jun 2008 22:39:56 -0600> Subject: Re: [DNA] Correlation of
>> Y-haplogroups J2 and J1with Neolithicagro-pastoral economies> > > > >
>> Yes, the IJ MRCA is just the most recent fellow who was ancestral to both
>> I > and J. Certainly his ancestors were also ancestral to I and J. IJ
>> began > after F as you say. But how much after is more difficult to work
>> out. I > can find the MRCA of J clades or I clades with the very small F
>> clade found > in European databases today. And that gives me one
>> estimate. It suggests > IJ was squeezed somewhat between previous node
>> and terminal node, but the > confidence intervals on these estimates are
>> pretty big. F survives in > Europe; IJ so far has not shown up.> > Ken >
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|Re: [DNA] Correlation of Y-haplogroupsJ2and J1with Neolithicagro-pastoral economies by "Ken Nordtvedt" <>|