For twins who grow up together, the degree of similarity of the environment is assumed to be equal. This is known as the

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The equal environments assumption is a fundamental assumption in twin studies, which assumes that the environmental experiences of identical twins (who share 100% of their genes) are no more similar than the environmental experiences of fraternal twins (who share 50% of their genes on average). This assumption helps researchers separate the effects of genes and environment on various traits and behaviors.

For Twins Who Grow Up Together, the Degree of Similarity