Twin and adoption studies are helpful for assessing
A) the validity of intelligence tests.
B) whether intelligence tests are biased.
C) the heritability of intelligence.
D) group differences in intelligence test scores.

Question

Quizplus · Accepted Answer

Twin and adoption studies are particularly useful for examining the extent to which genetics (vs environmental factors) influence traits like intelligence. By comparing the similarity of intelligence test scores among genetically identical twins, fraternal twins, and siblings who were adopted into different families, researchers can estimate the heritability of intelligence.

Twin and Adoption Studies Are Helpful for Assessing