The correlation in IQ scores between monozygotic twins reared together is higher than that between dizygotic twins reared together.What does this difference indicate about role of environmental and genetic factors in the development of intellectual ability?

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The higher correlation in IQ scores among monozygotic (identical) twins compared to dizygotic (fraternal) twins, even when reared together, suggests that genetic factors play a more significant role in the development of intellectual ability than environmental factors. This is because monozygotic twins share more genetic material (nearly 100%) than dizygotic twins (about 50% on average), leading to the conclusion that the similarities in IQ scores are more strongly influenced by genetics.

The Correlation in IQ Scores Between Monozygotic Twins Reared Together