According to the logic of behavioral genetics, which hypothetical finding would most strongly suggest that attention deficit disorder has a biological basis?
a. monozygotic twins show a much higher concordance rate than dizygotic twins
b. dizygotic twins show a much higher concordance rate than monozygotic twins
c. there is no effect of behavioral or nutritional interventions on the outcome
d. rates of the disorder are similar in populations with substantially different gene pools
Ans: a. monozygotic twins show a much higher concordance rate than dizygotic twins
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