Extensive twin and genetic studies consistently demonstrate that intelligence quotient (IQ) is a moderately to highly heritable trait, with genetic factors accounting for a substantial portion of the variance in cognitive test scores.
Evidence for · 6
Genetic and Environmental Influences on Vocabulary IQ: Parental Education Level as Moderator
1999 · cited by 304
The study estimates heritability of vocabulary IQ to be significant, though moderated by parental education.
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More for · 5
Genetic and environmental influences on executive functions and intelligence in middle childhood.
2020 · cited by 21
Twin analyses indicate that IQ displays moderate to high heritability estimates in childhood.
Accessing the development and heritability of the capacity of cognitive control.
2020 · cited by 0
Results demonstrate that cognitive control capacity and associated IQ are highly heritable.
Genetics of the association between intelligence and nicotine dependence: a study of male Swedish twins.
2011 · cited by 0
Findings show that IQ exhibits moderate heritability in young adult twin cohorts.
Substantial genetic link between IQ and working memory: implications for molecular genetic studies on schizophrenia. the European twin study of schizophrenia (EUTwinsS).
2013 · cited by 0
Bivariate analyses indicate that phenotypic correlations between IQ and working memory are largely driven by shared genetic variance.
Longitudinal Study of Language of Twins at Ages 9 and 14 Years: Twinning, Zygosity, and Heritability.
2026 · cited by 0
Longitudinal data report substantial heritability estimates for nonverbal intelligence quotient at age 14.