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Yes, genetics plays a significant role in IQ, with estimates suggesting genetics account for roughly 80% of the variance in IQ. However, IQ is a complex trait influenced by both genetic and environmental factors, with the latter including factors like nutrition, education, and environment. The degree of genetic influence increases with age, becoming stronger in adulthood compared to childhood.
Genetic influence
Polygenic trait: Intelligence is not determined by a single gene. Instead, many genes contribute a small effect to a person's intelligence.
Increasing heritability with age: Twin studies show that the heritability of IQ increases from childhood to adulthood, with some estimates suggesting it can reach around 80% in adults.
Genetic influence
Polygenic trait: Intelligence is not determined by a single gene. Instead, many genes contribute a small effect to a person's intelligence.
Increasing heritability with age: Twin studies show that the heritability of IQ increases from childhood to adulthood, with some estimates suggesting it can reach around 80% in adults.
