ORIGINS: UNIVERSE, LIFE, HUMANKIND, AND DARWIN

We debate origins of the Universe, life, Earth, humans, religion, atheism, using common sense, evolution, cosmology, geology, archaeology, and other sciences, to repel biblical creationism and other religious beliefs.

The modern human - Neanderthal relation may be more complex than previously thought

This article briefly discusses two scenarios for why modern non-Africans are more closely related to Neanderthals than modern Africans. The scenario that seems to be most popular at present is that Homo Sapiens populations interbred with Neanderthals to some extent after leaving Africa. The more complex scenario is that there was an ancestral African population that subdivided before modern humans left Africa, and that one of these populations was more closely related to Neanderthals and was ancestral to non-Africans. This would seem to imply that interbreeding may not be as important for explaining the shared DNA between modern humans and Neanderthals as previously thought.

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    Natalie A Sera

    But I find it unlikely that ALL of the Neanderthal-related people left Africa and no groups stayed behind. I don't THINK there are any such examples in historic times (if someone knows of such evidence, I'd be interested). Sure, there was a potato famine, and many Irish people left, but Ireland was NOT depopulated! The Japanese left Korea a long time ago, and their language is now quite different, but they are genetically indistinguishable from Koreans, because the Koreans stayed behind.

    So it seems to me that Occam's Razor (?) applies, and the simplest explanation is the best, unless evidence comes to show the contrary.

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      John Jubinsky

      Maybe its going past me but I don't see where the article provides any evidence that a population of modern humans with some Neanderthal characteristics first existed in Africa and then migrated out. My take is that the article suggests interbreeding between Neanderthal and modern humans after undiluted modern humans left Africa. Per the article:

       

      The research, published in the journal PLOS Genetics, provides a historical context for the interbreeding. It suggests that it occurred when modern humans carrying Upper Paleolithic technologies encountered Neandertals as they expanded out of Africa....The team estimate that Neandertals and modern humans last exchanged genes between 37,000 and 86,000 years ago, well after modern humans appeared outside Africa but potentially before they started spreading across Eurasia. This suggests that Neandertals (or their close relatives) had children with the direct ancestors of present-day people outside Africa.