A 2009 study was able to genetically identify individuals with full or partial Ashkenazi Jewish ancestry.[8] In August 2012, Dr. Harry Ostrer in his book Legacy: A Genetic History of the Jewish People, summarized his and other work in genetics of the last 20 years, and concluded that all major Jewish groups share a common Middle Eastern origin.[9] Ostrer also refuted the Khazar theory of Ashkenazi ancestry.[10] Citing autosomal DNA studies, Nicholas Wade estimates that "Ashkenazic and Sephardic Jews have roughly 30 percent European ancestry, with most of the rest from the Middle East." He further noticed that "The two communities seem very similar to each other genetically, which is unexpected because they have been separated for so long." Concerning this relationship he points to Atzmon's conclusions that "the shared genetic elements suggest that members of any Jewish community are related to one another as closely as are fourth or fifth cousins in a large population, which is about 10 times higher than the relationship between two people chosen at random off the streets of New York City".
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The authors concluded "In our view, Das and co-authors have attempted to fit together a marginal and unsupported interpretation of the linguistic data with a genetic provenancing approach, GPS, that is at best only suited to inferring the most likely geographic location of modern and relatively unadmixed genomes, and tells nothing of population history and origin."
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The Y chromosome of most Ashkenazi and Sephardi Jews contains mutations that are common among Middle Eastern peoples, but uncommon in the general European population, according to a study of haplotypes of the Y chromosome by Michael Hammer, Harry Ostrer and others, published in 2000.[13] According to Hammer et al. this suggests that the paternal lineages of Ashkenazi Jews could be traced mostly to the Middle East.
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