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Missing Heritability: Much More Than You Wanted to Know
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Since the family unit is a perfect natural experiment that isolates the variable of interest (genes) while holding everything else (culture and parenting) constant, within-family results are protected against stratification, assortative mating, and genetic nurture effects. There's no doubt that this reported findings have dealt a fatal blow to my conviction that behavioral traits are pre-eminently heritable…This is a remarkable example of an objective statistical fact mercilessly crushing the more subjective experiential sense of "A looks and acts more like B than C because A and B have the same parents." Thanks to everyone who helped me review this post, including Ruben Arslan, Alex Young, Damien Morris, and some other people who didn’t respond to my email asking if I had their permission to list their names publicly (if this is you, let me know and I’ll edit you in).
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