There is no evidence that mental disorders are purely caused by genetic inheritance- concordance rates are never 100%.
Gottesman and Shields reviewed the results of 5 studies of twins looking for concordance rates for schizophrenia. They found that in genetically identical twins there was a concordance of 50%. If schizophrenia was entirely produced by genetic inheritance we might expect the figure to be 100%.
Certain disorders, what individuals inherit is a susceptibility for the disorder but the disorder itself only develops if the individual is exposed to stressful life conditions (diathesis-stress model).
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