books.google.com - Genealogists are now using molecular genealogy— comparing and matching people by matrilineal DNA lineages— mtDNA or patrilineal Y-chromosome ancestry and/or racial percentages tests. People interested in ancestry now look at genetic markers to trace the migrations of the human species. Here’ s...http://books.google.com/books/about/The_Beginner_s_Guide_to_Interpreting_Eth.html?id=DHBuRpLQaKQC&utm_source=gb-gplus-shareThe Beginner's Guide to Interpreting Ethnic DNA Origins for Family History: How Ashkenazi, Sephardi, Mizrahi & Europeans Are Related to Everyone Else