What does it mean for heritability of intelligence to be between 60 to 80 percent in adult humans?
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Replying to @Race__Realist @2__X_ and
It means that 60-80% of the phenotypic variation in IQ can be explained by variation in genes.
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Replying to @Afrosapiens_44 @Evil_Kirkecraap and
This is the definition of heritability
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Replying to @Race__Realist @RadicalBayes and
The most important lesson of behavior genetics is not about genes, but about the environment: The effects of family upbringing, the classical measure of "nurture", on psychological traits are vanishingly small to nonexistent.https://drive.google.com/open?id=1RqsmwVj-VDcp7TbXBHoiW8xsPBGprIdv …
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Replying to @DegenRolf @RadicalBayes and
Can you imagine citing something that's literally under contention (twin studies)?
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Replying to @Race__Realist @RadicalBayes and
The noneffects of family upbringing were discovered by studying children in the same families and adoptive siblings, not by twin research.
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Replying to @DegenRolf @RadicalBayes and
How is the conclusion justified?
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Read my feature. Siblings, and adoptive siblings, are almost as different as randomly chosen people. The same upbringing, if influential, should have made them similar. All parents with many children discover this.
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