Define heritability. Summarize the evidence that genetics influences intelligence. Then, summarize the evidence that the environment influences intelligence.
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Heritability is a measure of how well differences in people's genes account for differences in their traits. ... Many disorders that are caused by mutations in single genes, such as phenylketonuria (PKU), have high heritability
These studies suggest that genetic factors underlie about 50 percent of the difference in intelligence among individuals. ... It is likely that a large number of genes are involved, each of which makes only a small contribution to a person's intelligence. Intelligence is also strongly influenced by the environment
Intelligence is also strongly influenced by the environment. Factors related to a child's home environment and parenting, education and availability of learning resources, and nutrition, among others, all contribute to intelligence.