By comparing behavior 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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This statement is true. Comparing the behavior within pairs of dizygotic twins with that of pairs of monozygotic twins can be used to determine the role of genetics in the development of a particular trait. Since monozygotic twins share 100% of their genes, any behavioral similarities between them are likely due to genetics, whereas dizygotic twins share only 50% of their genes on average, and any similarities between them can be due to shared genetics as well as shared environmental factors.

By Comparing Behavior Within Pairs of Dizygotic Twins (Fraternal Twins)with