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.
Answer: d.
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