The fact that the odds that a child born to two schizophrenic parents will become schizophrenic is less than 50 percent suggests that

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The fact that the odds of a child born to two schizophrenic parents developing schizophrenia is less than 50 percent suggests that schizophrenia is not produced by a single gene. If it were a single gene disorder, we would expect a 50 percent chance of inheritance. Therefore, the inheritance pattern of schizophrenia is much more complex than a single-gene disorder.

The Fact That the Odds That a Child Born to Two