What is the general conclusion of researchers who have investigated the influence of genetic factors on attention-deficit/hyperactivity disorder?
a. Genetic factors strongly contribute to this disorder.
b. The concordance rate for MZ twins is high, but symptoms appear to be reactions to other mental disorders.
c. Genetic factors seem to play no role in the development of this disorder.
d. The concordance rate among dizygotic twins is higher than it is for monozygotic twins.
Question 2
What did Michael Rutter find in the study of the association between family adversity and externalizing disorders?
a. There were no externalizing problems if there were no family problems.
b. There was no association between family problems and externalizing disorders.
c. The presence of one adversity factor was associated with a much higher rate of externalizing disorders.
d. The presence of two adversity factors was associated with a much higher rate of externalizing disorders.
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