Studies of the offspring of nonschizophrenic co-twins from discordant twin pairs suggest that ________
A) environmental factors play a more important role than genetic factors in the origin of schizophrenia.
B) genetic factors cause schizophrenia, while environmental factors are essentially unimportant.
C) a genetic predisposition to schizophrenia may remain unexpressed in some individuals unless it is released by some unknown environmental factors.
D) the heritability of schizophrenia involves the transmission of a single dominant gene.
Correct Answer:
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