Suppose that a researcher finds that pairs of monozygotic twins are no more similar on a trait than are pairs of dizygotic twins.What can you conclude regarding the contribution of biological and environmental influences to the development of that trait?

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If monozygotic twins (who share 100% of their genes) are no more similar on a trait than dizygotic twins (who share on average 50% of their genes), it suggests that genetic factors do not play a significant role in the development of that trait. Therefore, the heritability coefficient, which measures the proportion of variation in a trait attributable to genetic factors, would be low.

Suppose That a Researcher Finds That Pairs of Monozygotic Twins