Google

Mood disorders have been proven to have genetic basis. Individuals with relatives who have major depressive disorder are twice likely to develop such disorder. Individuals with twins with major depressive disorder are also prone to develop major depressive disorder themselves.

Individuals with relatives with bipolar disorder will nine times more likely to develop bipolar disorder themselves. Individuals with twins with bipolar disorder are also prone to develop such a disorder themselves.

Genetic Basis for Mood and Bipolar Disorders

Genetic factors appear to play a more significant role in the development of bipolar disorder than in major depressive disorder. This conclusion is drawn from two key observations: the risk of developing the disorder is substantially higher for relatives of individuals with bipolar disorder (over 9x) compared to those with major depressive disorder (2x), and the disparity in concordance rates between identical and fraternal twins is much greater for bipolar disorder (67% vs. 16%) than for major depressive disorder (50% vs. 38%).

Comparison of Genetic Influence in Bipolar Disorder vs. Major Depressive Disorder

Consider the cases of two individuals. Sarah's fraternal twin has been diagnosed with major depressive disorder. David's older brother has been diagnosed with bipolar disorder. Based on established patterns of heritability for these conditions, which individual has a greater statistical likelihood of developing the same disorder as their relative? Explain your reasoning.

Comparative Genetic Risk for Mood Disorders

A public health clinic is designing a screening program to identify individuals with the highest genetic predisposition for developing a serious mood disorder. Based on typical heritability estimates for these conditions, which of the following individuals should be considered the highest priority for outreach and screening?

Learn Before

Related