qnli question: Human geneticists argue that genetic variations have been identified that show high or low frequencies among Ashkenazi Jews? sentence: However, a 2013 study of Ashkenazi mitochondrial DNA, from the University of Huddersfield in England, suggests that at least 80 percent of the Ashkenazi maternal lineages derive from the assimilation of mtDNAs indigenous to Europe, probably as a consequence of conversion.