Two girls are monozygotic twins and two boys are dizygotic twins. If one girl and one boy are afflicted by a mood disorder, you can expect that, of the remaining twins,
a. there is a better chance that the other boy will have a mood disorder.
b. there is a better chance that the other girl will have a mood disorder.
c. there is an equal chance that the other boy and girl will have mood disorders.
d. neither the other boy nor the other girl is likely to have a mood disorder.
Answer: b. there is a better chance that the other girl will have a mood disorder.
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