Re: STR mutation rates
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Hi, Carl, I manage four cousins' kits in the Bryan surname project, two of them Big Y tests. Because of the matches between my two first cousins and a ninth cousin once removed--and a 5th cousin in betweener-- there is an opportunity for an interesting family study as we have relatively good paper pedigrees alongside the YDNA results.
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212555 --son of my mother's elder brother, has tested to 111 markers plus a SNP pack
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545965--son of my mother's younger brother --Big Y (at 111 STRs, 2 mutations different between these two male first cousins)
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d2095f84--fifth cousin, recruited to test in hope he would verify identity of 4th GG (he matched the two first cousins and verified my theory re 4th GG).
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503923--9th cousin once removed-Big Y;? recruited to test to verify match in the immigrant generation (he matched and the match verified the theory of which Bryan family we are part of--he descends from one immigrant brother Richard Bryant and the rest of us descend from Richard's brother John).
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I have many of the matches with my four test-takers on my family tree if you are interested in exploring kinships. Unfortunately the Bryan-surnamed fellow who in 2011 helped me figure out the Most Recent Common Ancestor between him and my cousin's kit 212555 has passed away and the fellow never upgraded to Big Y. The two of them match a cluster of fellows who didn't test beyond Y 67 or & 37.
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In terms of solving genealogy puzzles in my ancestry, I? have been very happy with the return on investment from sponsoring these tests. The first one listed--done in 2011--disproved the theory that our Bryans were part of a famous Bryan family represented by an immigrant named Morgan Bryan; these Bryans also are connected by marriage to Daniel Boone.
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I didn't mention my Bryan success stories in this blog posting I did for Genetic Genealogy Ireland--because I haven't yet found a Bryan-surnamed man in the UK or Ireland interested in taking me up on my free-kit offer on ISOGG's website.
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All my ancestors arrived in British colonial America before the Revolutionary War. Sponsored YDNA testing has helped find cousins in the country of origin with respect to my Horton and Sprowl/Sproule cousins, something I never could have done with autosomal testing.( I have had some English matches but considering the distance in kinship, it is difficult to identify the common ancestor).
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The MacKay match was just plain lucky because the Scots MacKay had tested two years before my Kentucky McKay tested --and the two matched.
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Linda R Horton