Which of the following patterns suggests a strong environmental component to a psychological disorder?
A. Identical twins are more likely to have the disorder than fraternal twins.
B. There is a gene-environment interaction for identical twins, but not fraternal twins.
C. Identical twins reared apart are no more likely to have the disorder than any two people.
D. Heritability estimates are higher for adopted populations than non-adopted populations.
Answer: C
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