If schizophrenia depended solely on genetic make-up, then compared to rates of schizophrenia in siblings in general, "fraternal" twins should have:
A) four times the concordance rate for schizophrenia.
B) twice the concordance rate for schizophrenia.
C) the same concordance rate for schizophrenia.
D) half the concordance rate for schizophrenia.
Answer: C) the same concordance rate for schizophrenia.
Psychology
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