Author Question: What evidence suggests that the development of schizophrenic disorders is not entirely explained by ... (Read 79 times)

sam.t96 · **on:** Jun 22, 2018

What evidence suggests that the development of schizophrenic disorders is not entirely explained by genetics?

a. None of the twin studies have found a concordance rate that even approaches 100 percent.
b. DZ twins are not 100 percent concordant.
c. Concordance rates for MZ twins are less than for DZ twins.
d. Concordance rates for DZ twins are less than for MZ twins.

Question 2

Leonard Heston conducted an adoption study of the possible causes of schizophrenia. What was the major finding in his study?

a. There was no evidence of a genetic influence on schizophrenia.
b. Adopted individuals had higher rates of schizophrenia regardless of the mental health status of their parents.
c. An individual's childhood environment has a much greater impact on the incidence of schizophrenia than do genetic factors.
d. Adopted children whose birth mothers were schizophrenic developed schizophrenia at a higher rate than did children born to normal mothers.