This article is intriguing. The authors address the difficulty in findings specific genetic correlates for behavioral traits despite the heritability estimates often being in the 50%-almost 100% range. They use ASD as a proof of concept and show that causation could derive from activities of genes that are at extremes instead of an optimum level in the middle of the curve.
How would their premise relate to the hypothesis that the major personality genetic factors seem to be mendelian recessive?
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