Pangur Bán
Deconstructed
Originally posted by DreadCthulhu
But there IS VERY strong evidence that humans are genetically undiverse. If humans did intermix with other hominids to any significant degree, and the offspring were fertile, blended into the human population, then you would expect there to be a LOT more genetic diversity in the human race.
If it is true that "a single tribe of a couple dozen chimpanzess has more genetic diversity than the entire human race" then you have to seriously doubt the significance of this for humans. And how much genetic difference is there between a late south asian homo erectus and a modern, non-mongoloid inhabitant of southern Asia? Skeletal differences between eskimos and western African "negroes" are larger than the differences between those two above. What reason do we have to suppose then that eskimos have more in common with west africans genetically than then do with pre-homo sapien sapien inhabitants of northern Asia?
Originally posted by DreadCthulhu
Currently, we don't know directly if early homo sapiens did or did not attempt to interbreed with other hominids, or if such a union could produce fertile offspring. But even if they did produce fertile children, said children had little or no effect on current human's genetic makeup.
Of course they did. I seriously doubt the "explosion" aspects of theories of human origin. I'm inclined to think that peoples all over the world were constantly evolving locally and constantly mixing, rather that some every-25,000s volkerwanderung, which looks suspiciously old-fashioned (C/f early modern theories about the racial connections with language). That kind of theory is the product of relying on the kind of poorly contexted archaeological evidence that I was attacking above.
Pre-historians simply don't have the evidence to construct any great theory like the "out-of-africa" theory. While that remains the case, I will stick to the view that makes the most sense. The out-of-africa theory isn't really a theory; like I said above, it is merely a suggestion.