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http://www.bbc.co.uk/programmes/p00xfdmwThe ancient remains of a female Neanderthal found in a remote cave in the mountains of Siberia are the source of the latest revelations about the sex lives of our ancestors. Hidden within her genome are traces of DNA from modern humans which reveal a genetic crossover that took place 100,000 years ago.
It means that we were interbreeding with our heavy-browed, stocky and now extinct relatives much earlier than was thought. Previous research had suggested that the two species first mixed about 60,000 years ago when humans migrated out of Africa and started to spread around the world. As they left the continent they met and mingledwith the Neanderthals, who lived across Europe and Asia.
But the finding that interbreeding took place tens of thousands of years before suggests that some early humans left Africa way ahead of the crowds. However the circumstances behind these early interspecies encounters remain unclear and whether they took place by choice or by force is not known.
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