The equal environments assumption states that

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The equal environments assumption states that dizygotic twins (who share 50% of their genes on average) are not treated differently from monozygotic twins (who share 100% of their genes) because they are assumed to share the same environment. This assumption is necessary for twin studies to make valid inferences about the genetic and environmental influences on a trait, assuming that any differences in trait similarity between monozygotic and dizygotic twins are due to genetic influences.

The Equal Environments Assumption States That