By comparing behaviour within pairs of dizygotic twins (fraternal twins) with that of pairs of monozygotic twins (identical twins), researchers can determine if monozygotic twins are more similar on a particular trait, on average, than dizygotic twins.

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Quizplus · Accepted Answer

This is a well-accepted method in twin studies to determine the heritability of a trait. If monozygotic twins are more similar on a trait compared to dizygotic twins, it suggests that there may be a genetic component to the trait.

By Comparing Behaviour Within Pairs of Dizygotic Twins (Fraternal Twins)