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

question 15

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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