You've perhaps had time to read my email of last weekend. I intend now to
send emails to individual groups with specific recommendations and have
already sent one to
For now, I've split
The testers in the main CF02 group have no proven descent from Benjamin Cooley of Springfield, MA and have had no advanced SNP testing. Many of them may well be Benjamin descendants but there is neither genealogical (correct me if I'm wrong) nor advanced genetic SNP testing that strongly indicates the probability.
Likewise, CF02/A has no known descent from Benjamin but has tested the
For the most part, CF02/B testers are known to have descended from
Benjamin and, to a degree, have had advanced SNP testing. Benjamin's
The CF02/C tester, a descendant of
So, other than the sharp genetic distinction between CF02/B and CF02/C and the likelihood that there are additional Samuell descendants among CF02, everything is pretty fluid. Advanced SNP tests can help sort it out. But before we can make any real progress, another known Benjamin descendant needs to take the Big Y test. Here's why.
David's most recent matching SNP,
Dating SNPs is not a science. That Y15926 may be 2500 years old is a
gross estimate. We know its relative position on the SNP tree, which helps.
And there are estimates about the average mutation rates for SNPs, but the
calculations are unreliable. Some put that estimate at about 1 mutation in
about every 150 years, others in about every 180 years. But if we multiply
However, if another Benjamin descendant tested, we would know all SNPs down to Ben's own birth in the early 17th century. I don't know that year, but David was born more than 400 years later! Out of his current 23 novel SNPs, how many novel SNPs would that leave? Maybe five? Maybe ten? In any case, a second test from the right person will increase the known SNP tree by perhaps 15. This will make the new tester a DNA pioneer by providing the genetic genealogy community with a handful of previously unknown mutations—and we will have a usable DNA fingerprint for Benjamin. One cautionary note, however: if Samuell was closely related to Benjamin, there may not have been sufficient time for a SNP to emerge that was unique between them—but perhaps so.
In a previous post I recommended that R1b testers, including CF02, do the
Although the basic concept of Y chromosomal descent is straight-forward, multiple iteration of a single idea can make the data very complex. Future posts should better illuminate the ins and outs of SNP discovery.