The underlying genetic basis for schizophrenia can be described as follows:
a. A single gene puts people at risk for it, especially if the environment switches it on.
b. Evidence suggests a minimal role for genetics, with environmental factors playing the strongest role.
c. If a combination of about 10 genes are inherited, the disorder occurs regardless of environmental triggers.
d. Multiple genes have been identified as risk factors, and environmental events, especially ones occurring prenatally, further increase the risk of developing the disorder.
Answer: B
Rationale: With the benefit of technological advances in molecular genetics, several candidate genes associated with schizophrenia have been discovered.
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