NPA personality theory
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Re: "Two unknown migrations from North to South America"
I guess there is so much linkage disequilibrium in an isolated population that the NPA genes are linked with the whole genomes sections that the researchers studied . And looking at the article more closely it appears that they had skeletal derived dna of actual individuals from so many thousands of years ago and not just present day sampling of indigenous people. So the inferences drawn about the genes pool in those migration routes is very accurate and especially likely to reflect early NPA habitancy