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…showed last 75 words of 509 total…statistics that have suggested that genetic basis has been established beyond doubt. However Jackson (1960) suggests that although the twins in Kallmanns studies have been reared apart from infancy that it does not take into account the life stresses that each incurred which could lead to schizophrenia. This leads to the next theory of causes to schizophrenia which unlike this theory which is a more clinical study this is more a behavioural study of the illness.