As for the genetic studies, you have got to love the Internet as people tend to cross-check claims…
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“Eran Elhaik's study proves the opposite…
First of all, it should be noted that Dr. Eran Elhaik never really claims that ALL (or even MOST) European Jews are descendants of converted Khazars - Yet alone "proved it".
His only claim is that the Khazar Empire was a transition point were Jews from all kinds of places (including Judea, Byzantine Empire, Iraq, Persia, and even Rome) met, mixed a bit with each other and with local Khazar population, and then continued to East and Central Europe - As on can see in his Fig 1:
Abstract. The question of Jewish ancestry has been the subject of controversy for over two centuries and has yet to be resolved. The “Rhineland hypothesis”
academic.oup.com
Here are the real conclusions of this study - with a link too it:
"We conclude that the genome of European Jews is a tapestry of ancient populations including Judaized Khazars, Greco–Roman Jews, Mesopotamian Jews, and Judeans and that their population structure was formed in the Caucasus and the banks of the Volga with roots stretching to Canaan and the banks of the Jordan."
Abstract. The question of Jewish ancestry has been the subject of controversy for over two centuries and has yet to be resolved. The “Rhineland hypothesis”
academic.oup.com
It's true that he does claim at some point that: "The Near Eastern–Caucasus ancestries are dominant among Central (38%) and Eastern (32%) European Jews followed by Western European ancestry (30%)"; And also that: "Although the Rhineland hypothesis explains the Middle Eastern ancestry by stating that Jews migrated from Palestine to Europe in the 7th century, it fails to explain the large Caucasus ancestry, which is nearly endemic to Caucasus populations"...
However, a quick look at his Fig 5 reviles that other Middle Eastern populations, like the Cypriots, Syrians and the Lebanese, got almost the same amount of "Caucasus ancestry" (~15% - 25%) and a much-much higher amount of "Near-Eastern ancestry" (that would probably be Turkic ancestry - which would make them closer to Khazars than the Ashkenazi Jews), and even some amount of "Western European ancestry" (10%-20%) - which altogether means that Askenazi Jews got most of their "Caucasus ancestry" and a bit of their "Western European ancestry" in their ancient homeland in the Middle East...
Here you can see it all, in his Fig 5:
Abstract. The question of Jewish ancestry has been the subject of controversy for over two centuries and has yet to be resolved. The “Rhineland hypothesis”
academic.oup.com
Now, the thing I like most about Eran Elhaik's study is the part were he tries to determine the "biogeographical origin coordinates" (i.e. where in the world thy most fit genetically today) of Eastern European and Central European Ashkenazi Jews by comparing their DNA to DNA of other populations who live today in different places of the world...
To make a long story short, he comes up with all kinds of coordinates in the northern parts of the Middle East - not even close to Europe... For example: The smallest deviations in the geographical coordinates were obtained with Armenians for both Eastern (38 ± 2.7° N, 39.9 ± 0.4° E) and Central (35 ± 5° N, 39.7 ± 1.1° E) European Jews... Now try running those coordinates on Google Maps, and you'll find that the biogeographical centers of Eatern (38° N, 39.9° E) and Central (35° N, 39.7° E) European Jews, are just a bit to the north and a bit to the south of the line between Ur-Kashdim and Harran - which are mentioned in the Bible as the original homeland of Abraham:
https://maps.google.com/maps/ms?msa=0&msid=200194895895720439502.0004dcc0c441bff010f2b
So, according to Elhaik's study, the "biogeographical origin" of Ashkenazi Jews is from the
same area that the Bible says Abraham came from - Funny, isn't it?”