Twin studies of gender differences have found that

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Twin studies have consistently found that monozygotic (identical) twins, who share 100% of their genes, are more similar in terms of gender roles and traits than dizygotic (fraternal) twins, who share only 50% of their genes on average. This suggests that biology and genetics do play a role in the development of gender roles and gender differences. Specifically, the fact that monozygotic twins are more alike suggests that genetics (and possibly prenatal hormone exposure) play a stronger role than environmental factors in shaping gender roles and traits.

Twin Studies of Gender Differences Have Found That