Which of the following is strong evidence for a genetic contribution to a behavior?
a) Dizygotic twins haved a higher concordance rate than do monozygotic twins.
b) Monozygotic twins have a higher concordance rate than do dizygotic twins.
c) Heterozygotic twins have a lower concordance rate than do monozygotic twins.
d) Adopted children resemble their adopted families wth regard to a trait.
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