Jtest september 27 2012 entrance discusses a method to identify the frequency of Ashkenazi genes in different populations (see the lower map). As expected, the origin of the Ashkenazi (European) Jews is in Rome, Italy. In fact, there are no specifically Ashkenazi genes, Ashjenazi genotype is a peculiar mosaic of a strong North Middle East (Kurdish) base and various accretions incorporated along Ashkenazi migrations and settlements in their long and convoluted history. The map seems to indicate the frequency of the genes that make up Ashkenazi genotype, not Ashkenazi blood itself. For example, South Germany appears to have 10% Ashkenazi mix, but the interpretation is that Ashkenazi and South Germans share parts of their genotype. Since Yiddish is a South German dialect, extract your own conclusions. We are the product of the Roman Empire.