Heritable and genetically determined are not the same thing, and the findings of these kinds of studies are less clear-cut than you suggest: > In all of these

Heritable and genetically determined are not the same thing, and the findings of these kinds of studies are less clear-cut than you suggest: > In all of these twin studies, however, researchers have rarely accounted for differences in the social context. ... > Highlighting the insights of Kurt Lewin more than 70 years after his work, the researchers found that socioeconomic background had a major impact on genetic influences on intelligence: More specifically, when twins were reared in high socioeconomic status environments, genes accounted for approximately 72% of variance in intelligence scores between twins. When reared in low socioeconomic status environments, genes accounted for only about 8% of variance in intelligence within the twin pairs. Source: https://www.psychologytoday.com/au/blog/under-the-influence/201204/intelligence-is-not-just-genetic https://www.psychologytoday.com/au/blog/under-the-influence/...