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Interesting. Good to read such evolutionary advances were not made in a couple hundred of years.
I wonder how mixing dna clusters will affect this thesis in a few thousand years
For Ashkenazi Jews in the U.S., who are intermarrying at a high rate, it will probably quickly lower their mean IQ to that of the surrounding population very soon. Maybe a century. In short, Jews will become less distinctive the more they intermarry.
.... I am guessing we will have mutants in NA while Japan and China are collapsing from weird new inbreeding diseases .....
By definition, very adverse negative mutations will not spread because they're not beneficial to reproduction.
Beneficial mutations, on the other hand, will spread around the world depending on the level of their benefit. If the benefit is high, then very quickly. If the benefit is not high, then much more gradually.