I always look at RA Fischer on this topic.
He basically invented most of modern statistics, pioneered genetics research, and was an open unapologetic eugenicist.
In the end he wrote that he opposed statements that race-based differences didn’t exist, but he was never able to prove or provide any evidence to support that claim.
Fischer’s point was genetic differences that contribute to race differences probably impacted intelligence. It’s a persuasive and logical argument that’s hard to refute.
But it turns out that what we know about within group heritability and genetics says nothing about other groups or races. No races have been shown to have selectively bred for higher intelligence, and all races perform roughly the same. As racial environments improve so do test and IQ scores, and IQ is largely influenced by familiarity with the structure of IQ tests and puzzles.
There are simply a lot of variables that add up and average out, there’s no one intelligence gene, and our own memory and experiences do more to shape intelligence than our genetics do.
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