What would prove decisively whether the B/W IQ gap is due to genes or not?
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No. Many genes are pleiotropic. As a consequence, a change can in sttucture could carry no effect because it is a side effect of selection acting on a completely different function. On top of that, there is drift https://www.nature.com/scitable/topicpage/pleiotropy-one-gene-can-affect-multiple-traits-569/ …
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