Interbreeding between archaic and modern humans been shown that Neanderthal ancestry has been selected against in conserved biological pathways, such as RNA processing. Consistent with the hypothesis that purifying selection has reduced Neanderthal contribution in present-day modern human genomes, Upper Paleolithic Eurasian modern humans (such as the Tianyuan modern human) carry more Neanderthal DNA (about 4–5%) than present-day Eurasians modern humans (about 1–2%). Genes affecting keratin were found to have been introgressed from Neanderthals into modern humans (shown in East Asians and Europeans), suggesting that these genes gave a morphological adaptation in skin and hair to modern humans to cope with non-African environments. This is likewise
The Origin of Species (The Outer Limits) next sentient species to arise could suffer the same fate, they built the ship to save a sample of that race before it wiped itself out, and protect it until it could repopulate the Earth. The ship extracted genetic material from the group students (and Hope) during the journey and created babies (modifying their genetics to avoid the dangers of inbreeding), creating a sufficient number of humans with enough genetic variation to repopulate the Earth. The Origin of Species (The Outer Limits) "The Origin of Species" is an episode of "The Outer Limits" television show. It was first broadcast on