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Continue to ChatGenes do make a contribution to the IQ score - but a flower needs soil. The environment for poor people is so overwhelmingly powerful, it washes out the genetic effect. There is a genetic contribution to IQ, but you can't detect it when you're living in a deprived environment. - Jerome Kagan from https://whatsmyquote.com/quote/genes-do-make-a-contribution-to-the-iq-score-but-a-flower-needs-soil-the-environment-for-poor-people-is-so