Thanks, Michael, for all the links and for taking the time to help
explain what it all means.
I'm intrigued by the 15 generations of descent. It's possible that one
day we may match
up with a Cooley that can reliably trace his line back to the 1500s or
beyond. And even
though Don didn't test positive for L176, that's not to say that our
Cooleys didn't pass
through or spend centuries in Scotland before John got on that ship.
Thanks, Don, for upgrading to the SNP test. I noticed that your
haplogroup is listed as R1a1a1.
Is that just an abbreviation for the unwieldy R1a1a1b1a3a?
Jim
On 6/25/2013 3:09 PM, ancestr2_at_host187.hostmonster.com wrote:
> Donald Wayne Cooley (a descendant of James) has just gotten back his Geno
> 2.0 Y chromosome SNP results. They're posted here under kit #N3690.
> (Remember, the Y chromosome passes from father to son only and is
> essentially a clone; it changes very little from one generation to the
> next.)
>
> http://www.familytreedna.com/public/Cooley/default.aspx?section=ysnp
>
> Those of you who have looked at the Cooley Project's DNA page will be
> somewhat familiar with the STR results:
>
> http://www.familytreedna.com/public/Cooley/default.aspx?section=yresults
>
> Each number represents the number of times a specified series of chemicals
> repeat. It's generally considered that after about 15 generations of
> descent too many mutations are introduced to make comparisons reliable.
> It's no surprise, then, that all the testers in CF01 match so closely, as
> most of us are known to be about 7 to 9 generations from John.
>
> SNPs are entirely different. They represent specific, single mutations of
> specifically located chemicals, for example, a change from A to G. The
> date at which the mutation occurred can be estimated, in part, by
> determining its frequency in respect to the size of a population. For
> example, the mutation known as M207 encompasses such a huge portion of the
> Eurasian population that it is estimated to have occurred between 19,900
> and 34,300 years ago. For all those generations, that mutation has passed
> from Don's ancient *patrilineal* ancestor to the present day. It's the
> mutation that is used to define the mega haplogroup R.
>
> http://en.wikipedia.org/wiki/Haplogroup_R-M207
>
> Don and I have both tested positive for the mutation known as L-448. This
> is considered to have occurred between 1900 and 2300 years ago in Norway
> and has been dubbed "Young Scandinavian." Don tested negative for the
> presence of L-176.1, which is the Scottish subset of L-448. This is in
> line with earlier interpretations of our STR markers: we are likely
> distantly related to, not descended from, the 12th century Scottish
> chieftain, Somerled.
>
> Lying downstream from L448 and upstream from L176.1 is CTS4179. The R1a
> Project reports that Don is negative for that marker but I don't see that
> it was even tested. I have an email into a project admin about that.
>
> Many of the younger markers have been recently discovered, and the
> interpretations are in a state of flux. Some markers once considered to be
> defining markers are now found to be specific to certain families and have
> been removed from the Y tree. At present, there are very few markers that
> have been verified as being "downstream" from L448. But it is my hope that
> one day we can lay claim to one of these "private" markers as being
> specific to our clan of Cooleys.
>
> -Michael
>
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>
Received on Tue Jun 25 2013 - 23:00:38 MDT