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Early humans were highly promiscuous and interbred 'multiple times' over a period of 35,000 years, according to a new study.
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Read More »Researches initially thought interbreeding between Neanderthals and other primitive cousins was rare - but have now discovered they lived in a 'world of debauchery' Early humans were highly promiscuous and interbred 'multiple times' over a period of 35,000 years, according to a new study. Researches initially thought interbreeding between Neanderthals and other primitive cousins was rare - but have now discovered they lived in a 'world of debauchery'. Analysis of Neanderthal DNA in modern East Asians and Europeans found our ancestors began to pour out of Africa and mingle with more species around 75,000 years ago Data from the 1,000 Genomes project - which has mapped the DNA of 1,000 people from around the world - suggests an environment of rampant promiscuity. It was a complex web of relationships in which individuals had intercourse with members of their own group - and different early humans, or hominins. Speaking from the US, corresponding author Dr Joshua Schraiber said: "I do think there was probably much more interbreeding than we initially suspected. "Some of the fantastical aspect comes from a lack of clear definition of 'species' in this case. "It is always very hard to know if an extinct group constituted a different species or not. "My guess is that any time two different human groups lived in the same place at the same time for a while, they probably had some sort of breeding contact." Video Loading Video Unavailable Click to play Tap to play The video will auto-play soon 8 Cancel Play now The groundbreaking work published in Nature Ecology & Evolution backs the idea interbreeding in recent human history was widespread. Geneticist Dr Fabrizio Mafessoni, who was not involved in the study, said: "The scenario of multiple episodes of modern-human-Neanderthal interbreeding fits with the emerging view of complex and frequent interactions between different hominin groups." Recent studies have found Denisovans, another extinct relative, had sex with Neanderthals and humans on numerous occasions. The Denisovan species was only discovered in southern Siberia a decade ago. They were genetically distinct from both Neanderthals and humans. There were at least three different human forms on Earth only 40,000 years ago - all having sex with each other. And there may have been more. When anatomically modern humans dispersed from Africa, they encountered Neanderthals in Europe and Asia. This left a signature in our genomes - with about two percent inherited from the Neanderthal. This DNA influences our immune system and the diseases we develop. Initially, it was thought only a single episode of interbreeding between modern humans and Neanderthals occurred. But East Asians have up to a fifth more Neanderthal DNA compared to Europeans - suggesting the possibility of many encounters. So biologists Dr Schraiber and co author Dr Fernando Villanea, both of Temple University, Philadelphia, carried out a series of computer simulations to explore the theory.
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Read More »Using AI (artificial intelligence) they found the different patterns of DNA in modern humans is explained by numerous periods of interbreeding between Neanderthal, East Asian and European populations. Dr Schraiber said: "These findings indicate a longer-term, more complex interaction between humans and Neanderthals than was previously appreciated."
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