To explain our genetic diversity, some scientists have suggested that early Homo sapiens mated with an undiscovered species. But new research offers a different explanation
No one has found physical evidence of these “ghost” hominins, however. There are no fossils, let alone DNA. And new researchBased on knowledge of how fast our DNA changes from generation to generation, it is possible to estimate a time when the common ancestors of people carrying different gene variants still had the same ones.
The new analysis is the first to include genetic data from dozens of Nama people, a pastoralist Khoe-San group in Namibia that Henn has collaborated with for years to reconstruct its unique history. “It’s funny,” she recalls, “when I talk to some of the participants and tell them we find they have the highest genetic diversity, and that they’ve probably been isolated in southern Africa for many thousands of years, they look at me and say: Yeah, we know that.
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