A team of geneticists at the University of California, Davis says its new research upends the dominant scientific model of how modern humans emerged, concluding that Homo sapiens likely arose not from a single ancestral population in Africa but from several genetically connected groups spread across the continent over hundreds of thousands of years.
The finding, built on 44 newly sequenced genomes from the Nama people of southern Africa and extensive computer modeling, directly challenges what scientists have long called the “Out of Africa” framework. That model held, for decades, that one main ancestral group gave rise to every living human. The UC Davis team says the DNA tells a different story.
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