The extent to which monozygotic and dizygotic twins show similarity within pairs on particular traits or behaviours can be used to estimate the heritability of the trait.

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This statement is true. Twin studies are commonly used to estimate the heritability of traits by comparing the degree of similarity between pairs of monozygotic (identical) twins, who share 100% of their genetic material, with that of dizygotic (fraternal) twins, who share about 50% of their genetic material on average. If monozygotic twins show greater similarity on a trait than dizygotic twins, this suggests that there is a genetic component to the trait, and the degree of concordance can be used to calculate an estimate of its heritability.

The Extent to Which Monozygotic and Dizygotic Twins Show Similarity