Uncle Judea, Melanin, Genetics, and Educational Attainment...
Highly Recommended: Judea Pearl and Dana Mackenzie: The Book of Why: The New Science of Cause and Effect https://books.google.com/books?isbn=0465097618. And: Aha! So I am not as stupid as I am ugly after all!:
Sokrates: "Your intuition is exactly right: SNPs for (or chromosomally linked to) melanin would predict educational attainment, in a sample drawn from the current over-all American population. The R^2 just for them might not be 10%, but it would certainly be non-negligible...
...Indeed, I would be somewhat surprised melanin-linked SNPs wouldn't be predictive even in a sub-sample of just those categorized as "black". The same would be true, though I suspect to a lesser extent, for SNPs (linked to) curly hair. The more fundamental point is that social and cultural inheritance, together with endogamy, mean that that there are certainly SNPs which predict your class background and the cultural traditions you were exposed to. (If we haven't identified SNPs which distinguish Baptists from Congregationalists among current Americans, it's pretty certainly because we've just not looked for them.)
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