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That is exceptionally contentious and probably inaccurate. We don't understand the workings of intelligence, the brain or genetics at this stage and no serious researcher puts it down to any one gene, let alone that.
I agree with the rest of the paragraph. Jews were (because of their status as tolerable (ie, non-heretical) non-Christians) encouraged/forced to be usurers, bankers and tradesmen, which effectively killed off their lower class, selected the smarter white-collar ones and flung them into a process of continued intelligence selection. But Northern Europe's influence therein was situational, not genetic, which was your original contention.
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I don't know enough about Central Asia to validate your claims about un-mixed survivors of the East Asian nomads. Nor the history of the Indian caste system.
My point was that Central Asia was Whiter in the past, not that the East Asian nomads were particularly dysgenic. And all East Asians aren't the same, they are adapted to different lifestyles. The Japanese, Koreans and Chinese being more civilized than their nomadic counterparts.
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Natural selection and adaptation cannot happen if the appropriate genes aren't available. You've got the source on Ashkenazi verbal genes; it comes from the disease which afflicts Northern Europeans disproportionately. The discmrimination against Jews is one side of the coin; the genes that fostered their resistance to it are another. Northern Europeans gave Jews the foundation for increased verbal ability, their discrimination against them then brought those genes to mutation.
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That source is not even close to authoritative, nor does it outright state Ashkenazi intelligence is entirely due to that gene. Furthermore Crohn's is not uncommon in southern Europe and its incidence amongst Jews is way beyond northern rates, anyhow. It may well have been picked up in the south. Founder effect negates, one way or the other, the argument that 'gene x is common amongst population y and ergo came from there.'
Who is rich? He who is happy with what he has - Simeon ben Zoma, Ethics of the Fathers, Talmud, Avot 4:1
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You deleted my post, the truth hurts doesn't it?
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The high incidence of selection for Crohn's disease and its association with verbal IQ is indeed indicitave that this affliction plays a monstrous role in Ashkenazi Verbal intelligence. Since Sephardic Jews have lower incidences of both Crohn's disease and lower verbal IQ, a southern origin is unlikely, though interbreeding between Jews will certainly spread these mutations around. I see no reason why anyone would be so skeptical about it, unless it made them angry.
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