I would venture to say most single origin surname Y-DNA projects have experienced NPEs where documented lines produce different results from the primary surname modal haplotype. I have a low-frequency surname with probably only 500 individuals (male and female) with three variations of the name and have tested 28 males. This is not a huge sample; but of those 28, eight participants have different haplotypes. Two of those are descended from unmarried women where their sons kept the surname. One line had an unofficial adoption. The other five are unknown; however, I have speculated on what may have occurred in each instance. Two I supposed are unofficial adoptions of a wife's child from a previous relationship. Two others are in two different lines where there were bigamous relationships and the child was born to the second wife; perhaps, in each case, the wife had been impregnated by someone else. The fifth may be a case where a child was born prior to marriage and mother may have identified the wrong man as the father when other possibilities existed. Unfortunately, many of my lines only have one or two males with the surname and triangulating the results would be impossible. As far as the effect on a one-named study, this is minimal as we are tracing the use of the surname and genetics are an adjunct to that study. I've looked at the GRO records for England and Wales from 1911-2006. Since 1960, there are interesting results with my surname. 29% of the male births with my surname occurred in lines with known NPEs. 17% of the male births were to unmarried women of my surname who registered their children under both the mother's and father's surnames. 7% of the male births were to unmarried women of my surname who registered their children under the mother's surname. Therefore, since 1960 in England and Wales, 53% males registered with my surname do not have our modal haplotype. In addition, there are 10% of the births where the lineage of the surnamed male cannot be ascertained based on the mother's surname alone. Therefore, the percentage of births with NPEs may even be larger. Jim On Sun, Jan 25, 2015 at 7:51 PM, Elizabeth Kipp via <goons@rootsweb.com> wrote: > I wonder if there has ever been anything written about the changes to > the family tree reconstructions as a result of yDNA results. Is there > any idea as to how many projects were affected? Certainly Blake was > thought to be somewhat less varied than it actually is. I am finding > that Pincombe/Pinkham which were always thought to be one family have > several different results. > > Elizabeth (Blake) Kipp BA PLCGS > Website: http://www.kipp-blake-families.ca/elizabethmain.htm > Blog: http://kippeeb.blogspot.ca/ > Guild of One Name Studies #4600 (Blake, Pincombe) > The Surname Society #1004 (Bedard, Dumoulin, Gregoire, Prevost, Blake, Pincombe, Knight, Rawlings, Cheatle, Butt, Buller, Taylor, Gray, Farmer, Lywood, Rew, Routledge, Welch, Coleman, Lambden, Arnold, Peck, Rowcliffe, Siderfin, Cobb, Beard) > > > > _____________________________________________ > > RootsWeb lists - surnames, regions, software, etc http://lists.rootsweb.ancestry.com/ > > ------------------------------- > To unsubscribe from the list, please send an email to GOONS-request@rootsweb.com with the word 'unsubscribe' without the quotes in the subject and the body of the message -- Jim James M. Owston, EdD Owston One-Name Study #5647 owston@one-name.org http://www.one-name.org/cgi-bin/search.cgi?find=5647