Which of the following observations provides the BEST evidence that intelligence test scores are influenced by heredity?
A) Japanese children have higher average intelligence scores than do American children.
B) Identical twins raised together are more similar in their intelligence scores than identical twins raised separately.
C) The intelligence scores of children are positively correlated with the intelligence scores of their parents.
D) Identical twins raised separately are more similar in their intelligence scores than fraternal twins raised together.

Question

Quizplus · Accepted Answer

Identical twins, who share 100% of their genes, tend to have more similar intelligence scores even when raised in different environments compared to fraternal twins, who share only about 50% of their genes and are raised in the same environment. This suggests a genetic component to intelligence.

Which of the Following Observations Provides the BEST Evidence That