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Lewontin came to that conclusion by examining exclusively blood type alleles, which was kind of asinine because they have no apparent geographic distribution pa
by zmalqp 4y ago
Lewontin came to that conclusion by examining exclusively blood type alleles, which was kind of asinine because they have no apparent geographic distribution pattern at all. Other genetic markers tell a much clearer story, as the principal component analysis shows. It couldn't really be any more obvious - the PCA makes a map. You can literally see each of the continents represented in a projection of genetic data.
- ImaCake 4y agoSomething like 30-50% of all human genetic variants are shared across continents. It's hardly asinine to say that a significant proportion of genetic variation is shared with everyone. Depending where you are talking about, ~20% of variation is unique to a given continent. I don't think PCA plots really tell us much beyond there being distinct genetic clusters? One could do a PCA only on people with european ancestry, or people living in a small town, and there would be plenty of interesting structure to look at. https://www.nature.com/articles/nature15393 https://www.nature.com/articles/nature15393
- hackerlight 4y ago"One could do a PCA only on people with european ancestry, or people living in a small town" That would be extremely interesting. Maybe a way to do polygenic risk scores for traits like IQ.
- lmz 4y agoIf the difference was 70 or 80% would they even be the same species?