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Fossils from China may show interbreeding among early humans

Mihai AndreibyMihai Andrei
March 19, 2013
in Anthropology, Diseases
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According to a research published by researchers from Chinese Academy of Sciences and Washington University in St. Louis, interbreeding was pretty common with our ancestors.

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They based their case on an approximately 100,000-year-old skull from Xujiayao in the Nihewan Basin of northern China, which has a rare congenital disorder caused by interbreeding. Enlarged parietal foramen (EPF) or “hole in the skull” still exists today, affecting one in every 25,000 babies; basically, their skulls just don’t close up.

So in order to prove that the disorder was more common then, you’d have to somehow show that its incidence was over 1 in 25.000. For me, analyzing just one skull just doesn’t cut it. However, researchers said that there are many such fossil skulls belonging to early Homo erectus, to the people living in the end of Stone Age having such genetic mutation that are rare in modern humans.

“The probability of finding one of these abnormalities in the small available sample of human fossils is very low, and the cumulative probability of finding so many is exceedingly small,” said Erik Trinkaus, professor of Anthropology in Arts & Sciences at Washington University in St. Louis and co-author of the study.

Sure, that does make a good argument, but not a very stable one; it doesn’t rule out a coincidence or some unlikely odds. They also found several abnormalities which point towards interbreeding, and the picture all of them form together does seem to suggest that this was a thing back then.

The research was published in PLoS ONE

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Mihai Andrei

Mihai Andrei

Dr. Andrei Mihai is a geophysicist and founder of ZME Science. He has a Ph.D. in geophysics and archaeology and has completed courses from prestigious universities (with programs ranging from climate and astronomy to chemistry and geology). He is passionate about making research more accessible to everyone and communicating news and features to a broad audience.

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