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Dr. Kay Kirkpatrick 🥄 @kay314159
, 11 tweets, 2 min read Read on Twitter
I just finished reading this excellent book, and I’m going to thread a few more quotes pulled from it.
p.61-62: "Suppose we have a population in which a particular trait--say, IQ--has been shown to have high heritability, and let us, for the moment, take that claim at face value. What, if anything, could we conclude about a genetic basis for IQ?
“Because we do not know the genes that are supposedly responsible for IQ, it is customary to take a population that is genetically varied in some general sense, perhaps with respect to race or sex. Now we measure the percentage of phenotypic variation due to genetic variation,
“and we find it is high (say, 50 percent). ... What does that have to do with the transmission of IQ from generation to generation? Well, perhaps something, but it says nothing about the mechanism of that transmission. ...
“So IQ might be passed on from generation to generation, but here the mechanism of transmission is mediated not by causal factors that (like genetic or more generally biological factors) are internally transmitted from parent to child, but
“rather [the mechanism of transmission is mediated] by causal factors (cultural biases) that are socially handed down through the generations."

"Take the studies of race and IQ, surely the most notorious example at hand. Here, the presence of absence of racism turns out to be a crucial feature of the environment,
”for the effect of racial difference on intellectual performance is strongly dependent on whether an individual grows up in a racist or a nonracist environment."
p. 84 (last one:)

"Let us ask not how much of any given difference between groups is due to genetics and how much to environment, but rather how malleable individual human development is, and at what developmental age. ...
“[T]here is no reason to privilege birth as a cutoff point--development is lifelong, and so is its plasticity."

From Evelyn Fox Keller’s Mirage of a Space between Nature and Nurture.
Whoops: “presence or absence”
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