Genetic evidence regarding twins and the risk for schizophrenia supports which fact?
a. Identical and fraternal twins are equal in concordancy for schizophrenia.
b. Monozygotic twins have a lower concordancy rate for schizophrenia than the general population.
c. Fraternal twins have a higher concordancy rate for schizophrenia than monozygotic twins.
d. Monozygotic twins are significantly more likely than the general population to be concordant for schizophrenia.
D
Concordancy rates are 50% for monozygotic twins. This rate is 50 times higher than for the general population. The other options are not accurate representations of research data.
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