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For populations of the Jewish diaspora, the genetic composition of Ashkenazi, Sephardi, and Mizrahi Jewish populations show a significant amounts of shared Middle Eastern ancestry.

According to Behar and colleagues (2010), this is "consistent with the historical formulation theories the Jewish people as descending from ancient Hebrew and Israelites of the Levant" and "the dispersion of the people of ancient Israel throughout the Old World" Jews living in the North African, Italian, and Iberian regions show variable frequencies of admixture with the historical non-Jewish host population along the maternal lines.

In this view, analysis of Ashkenazi Jews together with a large sample from the region of the Khazar Khaganate would corroborate earlier results that Ashkenazi Jews derive their ancestry primarily from populations of the Middle East and Europe, that they possess considerable shared ancestry with other Jewish populations, and that there is no indication of a significant genetic contribution either from within or from north of the Caucasus region." In 2016, together with R. The study was dismissed by Sergio Della Pergola as a "falsification", claiming it failed to include Jewish groups such as the Italkim and Sephardic Jews, to whom Ashkenazi Jews are closely related genetically.

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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" Concerning North African Jews, autosomal genetic analysis in 2012 revealed that North African Jews are genetically close to European Jews.

This finding "shows that North African Jews date to biblical-era Israel, and are not largely the descendants of natives who converted to Judaism," Y DNA studies examine various paternal lineages of modern Jewish populations.

North African, Italian and others of Iberian origin show variable frequencies of admixture with non-Jewish historical host populations among the maternal lines.

In the case of Ashkenazi and Sephardi Jews (in particular Moroccan Jews), who are apparently closely related, the non-Jewish component is mainly southern European. conducted a study on 1371 men and definitively established that part of the paternal gene pool of Jewish communities in Europe, North Africa and Middle East came from a common Middle East ancestral population.

A study conducted in 2013 found no evidence of a Khazar origin for Ashkenazi Jews and suggested that "Ashkenazi Jews share the greatest genetic ancestry with other Jewish populations, and among non-Jewish populations, with groups from Europe and the Middle East.

No particular similarity of Ashkenazi Jews with populations from the Caucasus is evident, particularly with the populations that most closely represent the Khazar region. Pirooznia, Elhaik advanced the view that the first Ashkenazi populations to speak the Yiddish language came from areas near four villages in Eastern Turkey along the Silk Road whose names derived from the word "Ashkenaz", arguing that Iranian, Greek, Turkish, and Slav populations converted on that travel route before moving to Khazaria, where a small-scale conversion took place.Studies of autosomal DNA, which look at the entire DNA mixture, have become increasingly important as the technology develops.They show that Jewish populations have tended to form relatively closely related groups in independent communities, with most in a community sharing significant ancestry in common.Two studies in 20 suggested that about 40% of Ashkenazi Jews originate maternally from just four female founders which are likely of Near-Eastern origin, while the populations of Sephardi and Mizrahi Jewish communities "showed no evidence for a narrow founder effect".Evidence for female founders has been observed in other Jewish arguing that "GPS is a provenancing tool suited to inferring the geographic region where a modern and recently unadmixed genome is most likely to arise, but is hardly suitable for admixed populations and for tracing ancestry up to 1000 years before present, as its authors have previously claimed.

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