The most important evidence of genetic effects on IQ is the so-called Flynn effect.

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The Flynn effect refers to the observed rise in IQ scores over time, across many parts of the world, which is largely attributed to environmental factors such as improvements in nutrition, education, and healthcare, rather than genetic changes. Genetic effects on IQ are more directly studied through family and twin studies, which examine the similarity in IQ between relatives to estimate heritability.

The Most Important Evidence of Genetic Effects on IQ Is