Adoption studies of intelligence suggest that:
A)Genetics is the sole determinant of intelligence.
B)Family environment more strongly determines intelligence than genetics.
C)Both genetics and environment contribute to intelligence.
D)Methods exist to assess the relative contributions of genetics and experience on intelligence.

Question

Quizplus · Accepted Answer

Adoption studies suggest that both genetics and environment contribute to intelligence. This is because adoptees share no genetic material with their adoptive families but may share genes with their biological families. As such, any similarities in intelligence between adoptive families and adoptees must be explained by environmental factors, while similarities between biological families and adoptees must be attributed to genetics. Studies have shown that both genetic and environmental factors are important in determining intelligence.

Adoption Studies of Intelligence Suggest That