http://www.healthanddna.com/ancestry-dna-testing/jewish-dna.html
Ashkenazi Jews are a group with mainly central and eastern European ancestry. Ultimately, though, they can be traced back to Jews who migrated from Israel to Italy in the first and second centuries, Behar said. Eventually this group moved to Eastern Europe in the 12th and 13th centuries and expanded greatly, reaching about 10 million just before World War II, he said
Genelex offers two DNA testing options to help confirm Jewish heritage.
Maternal Line or Common Female Ancestor Test (mtDNA for males or females) examines DNA from the maternal line (i.e., the mtDNA comes from the participant's Mother's, Mother's, Mother, etc.) and places the tested individual in a haplogroup. Certain haplogroups are associated with Jewish populations.
For instance, recent scientific evidence indicates that approximately 40% of current 8 million Ashkenazi have descended from four women . The estimated world Jewish population is about 13 million. They may have inherited their genetic signatures from female ancestors who lived in the Near East.
Each woman left a genetic signature that shows up in their descendants today. Together, their four signatures appear in about 40% of Ashkenazi Jews, while being virtually absent in non-Jews and found only rarely in Jews of non-Ashkenazi origin, the researchers said.
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