Which statement about research on the genetics of schizophrenia is accurate?
a. Too little genetic research has been done to come to any conclusions.
b. Heredity appears to play almost no role in causing schizophrenia.
c. Schizophrenia occurs only among identical and fraternal twins.
d. Multiple genes interact, while single genes make only a minor contribution.
Question 2
A follow-up study by Wiersma and colleagues (1998) reported impairment with no recovery after the first episode for approximately what percentage of individuals diagnosed with schizophrenia?
a. 11
b. 14
c. 25
d. 50
