Researchers have found that when an identical twin has unipolar depression, there is a 38 percent chance that the other twin has already had or will eventually have the same disorder. A fraternal twin is only 20 percent likely to have the same disorder. This finding:
A) proves that unipolar depression does not have a genetic factor.
B) supports the idea that people may inherit a predisposition for developing unipolar depression.
C) shows that spending time with people who have unipolar depression increases an individual's own risk for developing the same disorder.
D) demonstrates that if one sibling has unipolar depression, other siblings of the same sex are likely to develop the same disorder.

Question

Quizplus · Accepted Answer

The higher concordance rate of unipolar depression in identical twins (who share more genetic material) compared to fraternal twins suggests a genetic predisposition to the disorder, supporting the idea that genetics play a role in the likelihood of developing unipolar depression.

Researchers Have Found That When an Identical Twin Has Unipolar