Comments by "1" (@user-yt3xd2jl6d) on "The HIDDEN Neanderthal Traits in Modern Humans..." video.

  1.  @noahtylerpritchett2682  It is not yet understood why Asian or Oceanic populations have more Neanderthal related DNA. Three hypotheses; the first that Neanderthals and Denisovans in Asia mixed, this makes sense since Denisovans found in Siberia have between 16% and 50% Neanderthal DNA, when anatomically modern humans left Africa they first mixed with Neanderthals from the Middle East and then mixed with Denisovans (who already had Neanderthal admixture). The second hypothesis, Denisovan populations collapsed in Asia and were replaced by Siberian Neanderthals, then the humans who arrived mixed with these Neanderthals, however this second theory cannot explain why Oceanic populations have high frequencies of Neanderthal DNA. Third hypothesis, Neanderthals in Europe were highly inbred (studies have shown this), inbreeding led to the accumulation of many genes associated with genetic diseases, so natural selection simply weeded out the harmful genes in Europeans, but Asian & Denisovan Neanderthals were not as inbred, so they weeded out fewer Neanderthal genes.
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  2. If among Europeans, Scandinavians have more alleles related to Neanderthals, in fact Northeastern Europe has the highest frequencies as do Finns and Uralic-speaking Russians. However, the highest frequencies are not related to Europeans, it has been observed that Asians have higher allelic frequencies related to Neanderthals, more specifically in Northeastern Asians, Tibetans and in Oceania more specifically in Papuans. Higher frequencies of archaic HLA genes have been observed in Finnish populations, these genes are related to resistance to certain types of pathogens, which African populations did not have.
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