Studies of rates of schizophrenia among adopted children have shown that
a. the presence of schizophrenia in the adopted parents correlated with schizophrenia in the adopted children.
b. the presence of schizophrenia in the biological parents correlated with schizophrenia in the adopted children.
c. the presence of schizophrenia in the adopted parents appeared to be as important as the presence of schizophrenia in the biological parents in predicting outcomes of the adopted children.
d. neither schizophrenia in the adopted parents nor in the biological parents appeared related to the presence of schizophrenia in the adopted children.
Question 2
If a concordance rate for a disorder is found to be 60 percent in identical twins, what does this mean?
a. Genetics play little if any role in either twin's risk for the disorder.
b. The environment plays little if any role in either twin's risk for the disorder.
c. The probability of both twins being diagnosed with the disorder is about 60 percent.
d. If one twin is diagnosed with the disorder, the other twin has about a 60 percent chance of also being diagnosed with the disorder.
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