GEN • GEN: Michael Cooley's Genetic Genealogy Blog
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24 May 2016
SNP Results for Tester in Cooley Group CF02
A descendant of Abraham
Cooley (c1740-1820) has tested positive for Y-SNP Y15926. To date, this is the terminal SNP for David
Cooley, a prior president of the Cooley Family Association of America
and descendant of Benjamin
Cooley (c1615-1684) of Springfield, MA. This marker, however, is about
2500 years old and, therefore, can't be used as evidence that Abraham was
Benjamin's descendant. Still, its appearance has prompted me to make a
small change in the way I have the group organized, which will continue to
evolve as new genetic evidence comes in.
I've moved the test results for Hezekiah
Cooley's descendant, once part of the original broad grouping of CF02, to CF03. That
tester is positive for U152 which is negative for all
other CF02 members, including David. The results for Abraham and his
brother Thaddeus Cooley
(-1814) of Wythe County, VA are now in CF02/C. By definition, like David,
both would be negative for U152. Likewise, the two testers in CF02/A are
negative for it.
Another descendant of Benjamin's is waiting for Big Y lab results.
Because he's descended from a different son than David is, all shared SNPs
have come to them from Benjamin. Their SNP differences, which may be no
more than a dozen or so each, will have emerged during their separate
lineages from Benjamin. Once the lab results are completed and analyzed, we
will know Benjamin's terminal SNP, one that would be roughly contemporaneous
with his birth in c1615. Others can then test for that SNP. But because we
won't know exactly when it came into Benjamin's own Y-lineage, those who
descend from a collateral line might share it. Testing individually for the
SNP, then, will not prove descent from Benjamin but the likelihood of it
will be strengthened. Of course, those who will be negative for the
now-hypothetical Benjamin SNP could not possibly be a descendant of his, and
that in itself will hold significant value for such testing.
For more information, see the Y-STR results at the Cooley
DNA Project as well as additional postings here.