The Texas Adoption Study investigated the role of genetics and environment in intelligence. Genetics have a significant influence on IQ, with a stronger impact as individuals age.
The Texas Adoption Study compared the IQ tests of adopted children with both their biological and adoptive mothers. Research shows that genetics play a significant role in determining intelligence, with between 40% and 80% of IQ variability attributed to genes. Additionally, the study revealed that as children age, genetics become a stronger determinant of intelligence.
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