Which of the following statements supports the theory that intelligence is determined in part by genes?
a. The correlation between IQ scores is stronger for fraternal twins than it is for identical twins.
b. Diet and lifestyle factors influence intelligence.
c. Offspring are more similar to their parents when they grow up with them as opposed to when children are raised apart from their parents.
d. Identical twins separated by adoption still have highly correlated IQ scores.
Answer: D
Rationale: Even when identical twins are adopted and raised apart, their intelligence scores are still correlated at approximately .80—a very strong relationship.
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