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In addition to MariaAnt's good contribution, let me take another angle. You wrote: Studies comparing identical and fraternal twins, or occasionally identical twins reared apart have mostly concluded that there is a pretty high heritability of IQ. These studies, in particular the identical twins reared apart studies, imply that someone with the same genes ...


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There are several ways in which this apparent paradox can be resolved. As a starting point, it is important to consider how heritability is defined and assessed (also see this earlier answer). As you point out, heritability estimates originate from comparisons between people who differ in their genetic similarity (e.g., monozygotic vs. dizygotic twins). The ...



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