… genetic study finds.
"A new genome-scale study that includes a University of Kansas anthropological geneticist has determined ancestors of present-day Native Americans arrived in the Americas as part of a single-migration wave from Siberia no earlier than 23,000 years ago.
Later migrations of Aleuts and Eskimos occurred approximately 9,000 and 4,000 years ago.
Using coalescence analyses, not just using one piece of DNA, but the entire genome, we find that the earliest someone could have come to the Americas was 23,000 years ago," said Michael Crawford, head of KU's Laboratory of Biological Anthropology and a professor of anthropology. "This study also pretty well does in the whole idea that gene flow from Europe contributed to the original migration of present-day Native Americans."
Crawford is a co-author on the study, and the journal Science has published its results online. The Center for GeoGenetics at the University of Copenhagen headed the international research team, which included co-authors Eske Willerslev, a Lundbeck Foundation professor at the center in Copenhagen; Maanasa Raghavan, a postdoctoral researcher at the center; Yun Song, a professor of electrical engineering and computer science, statistics and integrative biology at University of California, Berkeley; and David Meltzer, an anthropology professor at Southern Methodist University, among others…"
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