Blogger NuSapiens offers an intriguing <a href=" comment on my post about Neandertal introgression:
It's been shown that some mtDNA lines are associated with metabolic adaptations related to climate. This is a serious violation of the neutrality requirement for tracking things, especially far back in time. Adam and Eve are cute stories, but I wonder whether they will be around after another generation. Neanderthal disappeared during a climate shift in Europe. If Neanderthal mtDNA was adapted to Euro-tundra, I wouldn't expect that to stick around very long during a thaw period. If at all, it might be in the far north.