One problem with twin studies is that the experiences of monozygotic twins may be more similar than the experiences of dizygotic twins so that heredity appears to have a greater influence.

Question

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Monozygotic (identical) twins share 100% of their genetic material, whereas dizygotic (fraternal) twins share only about 50% of their genes on average. This means that monozygotic twins may have more similar experiences due to their identical genetic makeup, which could make it harder to separate the effects of genetics and environment on a given trait or behavior.

One Problem with Twin Studies Is That the Experiences of Monozygotic