Describe the research results suggesting that there is a greater genetic influence on bipolar disorder than on depressive disorder

Answer:

(1) There is a greater difference in the concordance rates for MZ and DZ twins in the case of bipolar disorder than in the case of depressive disorder. (2) The rate of bipolar disorder in family members of depressive patients is similar to the rate in the general population, but the rate of depressive disorder in family members of bipolar patients is higher than the rate in the general population.