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

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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.

If Differences Among People in Their IQ Scores Are Based