If schizophrenia did NOT have a genetic basis,then concordance for schizophrenia in identical twins would be:

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If schizophrenia did not have a genetic basis, identical twins would not share a higher risk of developing the disorder compared to non-identical twins or siblings. Therefore, their concordance rate would not be significantly different from the general population, which is very low for schizophrenia.

If Schizophrenia Did NOT Have a Genetic Basis,then Concordance for Schizophrenia