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If a Fraternal Twin Develops Schizophrenia, the Likelihood of the Other

Question 2

Multiple Choice

If a fraternal twin develops schizophrenia, the likelihood of the other twin developing serious mental illness is much lower than with identical twins. This suggests that


A) schizophrenia is caused by genes.
B) schizophrenia is influenced by genes.
C) environment is unimportant in the development of schizophrenia.
D) identical twins are especially vulnerable to mental disorders.

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