Y chromosome study sheds light on Athapaskan migration to southwest US A large-scale genetic study of native North Americans offers new insights into the migration of a small group of Athapaskan natives from their subarctic home in northwest North America to the southwestern United States. The migration, which left no known archaeological trace, is believed to have occurred about 500 years ago. The study, led by researchers at the University of Illinois, is detailed this month in the American Journal of Physical Anthropology. It relied on a genetic analysis of the Y chromosome and so offers a window on the...