Here is our latest draft phylogenetic tree for I-Y33765.
Click on image to enlarge
This chart includes a tenth man derived (+) for the I-Y33765 mutation, Clements YS51041. He lives in the Midwestern region of the United States and has recently tested the SNPs Y33765 and BZ4354 at YSeq. His result was derived (+) for Y33765 and ancestral (-) for the BZ4354 test. This is consistent with his documented direct male ancestry which is from the parishes of Marksbury and Compton Dando in the lower Chew Valley, Somerset. His ancestor, George William Clements (1809-1891) was born in the village of Draycott, Somerset and sailed with his family to New York, USA in 1842. This is a further example of the participation of I-Y33765 men in the nineteenth century migrations from Europe.
Genealogy for Clements YS51041 shows that he is an eighth cousin once removed with Clements B742594 (YS32054) and they consequently share a 19 generation pedigree. Their earliest known direct male ancestor is Francis Clement (circa1630-1708) who was Parish Clerk of Compton Dando during the closing years of the Commonwealth. This pedigree implies that their Y-chromosomes are separated by 647 years, with an average generation time of 34.05y. This well documented pedigree is of similar duration to the Jacobsson IN70815 - Hallberg YF80422 pedigree on the Swedish arm of I-Y33765 which I used in 2020 to estimate a clade specific mutation rate. I hope that shortly I may be able to repeat this process using the new Clements pedigree and so obtain a comparison between SNP mutation rates in the English and Swedish populations of I-Y33765 men.
