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To quote 'Maciamo', who has notably helped in making countless maps concerning haplogroups on Eupedia: "What picked my interest is that half of Ashkenazi Jews of Western and Central European origin, and one third of Eastern European origin belonged to haplogroup K, compared to an average of only about 5% in Europe and 6.5% in Germany. How could this have happened? Genetic drift? Natural selection? This is how I remembered that haplogroup K, and especially K1, had been associated with higher brain pH, better brain connectivity and higher IQ. Several studies have determined that Jewish people had the highest average IQ of any ethnic group, and there is no need to demonstrate that the number of famous Jewish scientists, economists, academics, Nobel laureates, etc. is disproportionately high compared to their share of the world population (even if we only look at developed countries). There are surely other genetic factors than merely mitochondrial DNA, but if mtDNA does play a role in intelligence could this haplogroup have been positively selected within the Jewish population over the centuries to cope with the more intellectual occupations that the Jews have tended to specialise in? [Or was the haplogroup present in the Ashkenazi population at a high percentage in the first place, meaning that, even without the accidental eugenics that made the Ashkenazi IQ what it is, the Ashkenazi IQ is naturally higher?]"
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