Scientists had previously concluded that the bottleneck of about 350 Jews that created the genetic markers common among Ashkenazi Jews would have occurred about 700 years ago (the period of the ...

This image is a reconstruction history of Ashkenazi Jews and Europeans. It indicates the former to descend from a small, 'bottleneck' group, which is admixed between Europeans and Middle Easterners.

Erfurt’s medieval Jews carried many of the same diseases associated with Ashkenazi Jews today ... understood to have created the genetic “bottleneck” that created the genetic markers ...