It's at odds with "heritable or not", the interesting question to us peasants. If there's a disease that gives you spots, we want to know if you can get it from your ma and pa. We don't want to know that nearly everybody hides the spots with makeup.
replyThen there's the matter of whether there's just a small population with the genes for it, and whether it's polygenic, or mitochondrial, or otherwise non-mendelian, and all that gets factored into this heritability value along with cultural things like the use of concealer and the probability of having your face torn off by a bear. It kind of reminds me of inflation, as a useful measure.
You can see why this is so frustrating for laypersons, but the point isn't that you can't use a colloquial meaning of the word when shooting the shit with your friends or whatever. It's just important to keep the rigorous definition separated from the informal definition when citing the literature, or you end up in weird places.
replythinking about how to communicate it in a clear way. “the control knobs of what actually makes us different from one another” — you don’t expect one of your kids to be quadripedal. otoh this doesn’t really capture the precise notion either.
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