Mood Disorders - BIOLOGICAL EXPLANATION - GENETIC

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Family studies: where a sufferer of a mood identifies disorder and their families are studied

  Winokur found that the rate of unipolar depression was 10.9 % in first-degree relatives of the sufferer compared with 4.9% of control.

  Weissman et al found that 50 % of offspring to depressive parents displayed depression themselves

Evaluation

  Family studies do not rule out the effects of environment so the result of the experiments are not necessarily due to genetics. X

  Children of depressive parents are exposed to stressful environment X

  Conclusion cant be drawn from family studies alone X

Twin

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