Suppose for a particular personality trait, dizygotic twins both share the trait 13% of the time while monozygotic twins share the trait 14% of the time. The heritability for this trait would be close to
A) 0
B) .13
C) .14
D) 1
Answer: A
Rationale: Heritability is a statistic, expressed as a number between zero and one, that represents the degree to which genetic differences between individuals contribute to individual differences in a behavior or trait found in a population. Because the trait is only slightly more likely to be shared by monozygotic twins (who are genetically identical) than dizygotic (who are not), the heritability appears close to zero.
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