If differences among people in their IQ scores are based largely on differences in heredity, we should expect to find that

A) the correlation in IQ scores should be higher for fraternal twins than for identical twins.
B) the correlation in IQ scores should be higher for identical twins than for fraternal twins.
C) children reared by their own parents should have higher IQs than do children reared by adoptive parents.
D) children reared by adoptive parents should have higher IQs than do children reared by their own parents.

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Britney Rodriguez · Accepted Answer

Final Answer : B, Explanation :  Identical twins share 100% of their genes, while fraternal twins share about 50% on average. Therefore, if IQ scores are largely determined by genetics, we would expect the correlation in IQ scores to be higher for identical twins - who share more genetic material - than for fraternal twins. Studies have found a higher correlation in IQ scores between identical twins than between fraternal twins, supporting the idea that genetics play a significant role in determining IQ scores.

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