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In the adoption study reported in the chapter, the highest rate of schizophrenia was found among adoptees who had:
AHigh genetic risk and a disturbed family environment
BHigh genetic risk but a healthy family environment
CLow genetic risk and a disturbed family environment
DLow genetic risk within a healthy family environment
Answer & Solution
Correct answer: A. High genetic risk and a disturbed family environment
1. The study crossed genetic risk with family environment to produce four groups of adoptees.
2. Adoptees at high genetic risk raised in a disturbed family environment showed the condition at 36.8 per cent.
3. High genetic risk with a healthy family environment fell to 5.8 per cent, and low genetic risk with a disturbed environment to 5.3 per cent.
4. Low risk with a healthy environment was lowest at 4.8 per cent.
5. The chapter's conclusion is that both genetic vulnerability and environmental stress were necessary, since neither factor alone raised the rate anywhere near the combined figure.
_Source: OpenStax Psychology (1st ed., CC BY 4.0), Ch 3 "Biopsychology", §3.1 Human Genetics_
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