PBS Becoming Human (3 of 3) Spencer Wells, geneticist, says all modern humans share 99.9% genetic diversity at the DNA level. https://en.wikipedia.org/wiki/Neanderth me_project says neanderthals share 99.7% genetic features with modern humans (chimps are at 94%).
Is it possible for an isolated community of modern humans today to have something less than 99.9% shared dna diversity compared to another group? Though this is not going to be a popular research area for social reasons, has anyone documented the genetic diversity among modern humans?
My questions:
how is "species" defined regarding archaic Homo examples when we now have access to their genetic data? neanderthal, denovisians and (according to the same PBS program) neanderthals had larger brains and had the genetic markers indicative of human speech ability.
Why are H. neanderthals not H. sapien? Whatever is that answer, why will that not apply to modern human groups based on the same criteria? Thank you.