A continuous trait was examined in monozygotic (MZ) and dizygotic (DZ) twins. Twin pair results, and the correlation (r) of each is shown in graphs below. Choose the best statement below to describe these results. MZ twins Twin 2 r = 0.9 Twin 1 DZ twins Twin 2 r = 0.6 Twin 1 The high correlation for all twins indicates this trait is heritable Because correlation for MZ twins is greater than DZ twins, this trait is heritable Because correlation for DZ twins is greater than MZ twins, this trait is heritable There is no evidence this trait is heritable
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If a trait is heritable, we would expect the correlation between MZ twins to be higher than the correlation between DZ twins, since MZ twins share more genetic material. In this case, the correlation for MZ twins is 0.9, and the correlation for DZ twins is 0.6. Show more…
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