What evidence suggests that major depressive disorder is at least partly heritable?

Question

Quizplus · Accepted Answer

The fact that monozygotic twins, who share all of their genetic material, are more similar in depression than dizygotic twins, who share only half of their genetic material, suggests that there is a genetic component to major depressive disorder. This finding supports the idea that the disorder is at least partly heritable. None of the other options provide evidence for this conclusion.

What Evidence Suggests That Major Depressive Disorder Is at Least