No, they're developing 'polygenic scores' that add up the effects of thousands of genes on IQ. So that could work.
The four laws of behavior genetics (each supported by hundreds or thousands of studies) HT @SteveStuWillpic.twitter.com/hU2l9zOhrp
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Many of the modern samples have tens of thousands of twins or DNA from hundreds of thousands of people.
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I don’t understand the third law. If it isn’t the environment or genetics that explain the variance in behavioural traits, what else explains it? What do behavior geneticists hypothesize it might be?
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Random neurodevelopmental noise. The stuff that makes identical twin animals different from each other even if raised in the same habitat by the same parents.
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Conscientiousness, one of the Big Five personality traits, is moderately heritable. So, this is a real issue.
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I don't see how law 4 could be correct as written. Human IQ vs intelligence of other primates must be largely explained by genes. It isn't the shared environment that makes us smarter than a banana. Therefore, there must be some set of genes that account for the entire gap.
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Law 4 says the difference is caused by thousands of genes with small effects that get added together (making it difficult to find all of them). Also, I think we need a common measuring stick - like ability to survive and reproduce - when comparing intelligence across species.
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