The document discusses the genetic influence on intelligence test scores, attributing 50% of the variation to heredity. It highlights studies indicating a significant genetic contribution, particularly through twins, families, and adopted children, with adopted children's intelligence aligning more with that of their adoptive parents as they age. The text also notes that higher socio-economic status is associated with increased scores, while environmental deprivation leads to lower scores.

2. The variation in intelligence test scores
attributable to genetics. We credit heredity
with 50% of the variation in intelligence.

3. Studies of twins, family members, and adopted
children together support the idea that there is a
significant genetic contribution to intelligence.

4. Adoption Studies
Adopted children show a marginal correlation in
verbal ability to their adopted parents.

5. As children grow in age, their intelligence moves closer to that of their
adoptive parents.
Higher socio-economicstatus= large increase in scores
Environment deprivation =lower scores