With regard to the genetic basis of schizophrenia,

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While there may be genetic factors involved in the development of schizophrenia, it is unlikely that a single "schizophrenia gene" exists. Instead, it is believed that multiple genes contribute to a person's susceptibility to developing the disorder. Additionally, research has shown that the concordance rate for schizophrenia is higher among monozygotic twins than dizygotic twins, indicating a genetic component. Adoption studies also suggest a biological basis for schizophrenia. However, having a genetic susceptibility does not guarantee that a person will develop the disorder, as environmental factors also play a role.

With Regard to the Genetic Basis of Schizophrenia