Re: Questions about DNA Sephardic vs Ashkenazi #dna #sephardic


Adam Cherson
 

Admixture reports cannot do this because of the many genetic recombinations over 8 generations (one cannot determine which ancestor(s) are producing the Sephardic signal). The only possible DNA strategy would be to obtain the yDNA (SNP) fingerprint of the 8th ancestor's line and then attempt to evaluate whether that particular terminal yDNA SNP fingerprint matches any other proven, modern Portuguese-Sephardic lines. While this is a theoretically possible strategy it is difficult to achieve in practice because you must first identify a modern yDNA descendant of the 8th ancestor, and then be lucky enough so that the ancestor's yDNA SNP fingerprint matches one of the known modern Portuguese-Sephardic ydna lineages. To successfully implement this strategy you must be working with terminal SNPs (i.e. the results from the Big Y 700 test at FTDNA) because anything less would provide an indeterminate answer. For example from experience I can say that the AB-022 line on the JewishDNA.net list contains both Sephardic and Ashkenazic lineages--- so just knowing that much information would not be enough. One needs to know which tiny sub-branch of AB-022 is the terminal 'twig'.
--
Adam Cherson

Join main@groups.jewishgen.org to automatically receive all group messages.