The heritability of IQ scores appears to increase between infancy and adulthood.

Question

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Studies have shown that heritability of IQ scores increases from infancy to adulthood, indicating that genetic factors play a larger role in determining IQ in adulthood than in infancy. This is likely due to both genetic and environmental factors, as individuals have more opportunity to express their genetic potential as they age, and also may engage in activities or pursue education and training that amplify their underlying genetic traits.

The Heritability of IQ Scores Appears to Increase Between Infancy