If a study showed that both monozygotic twins had about a 45 percent chance of having unipolar depression when one twin had unipolar depression, this would provide:
A) very little support for the existence of a genetic factor in unipolar depression.
B) moderate support for the existence of a genetic factor in unipolar depression.
C) strong support for the existence of a genetic factor in unipolar depression.
D) near-certain support for the existence of a genetic factor in unipolar depression.

Question

Quizplus · Accepted Answer

Monozygotic twins share 100% of their genes, so if one twin has unipolar depression and the other twin has a 45% chance of also having unipolar depression, this suggests that there is a genetic factor involved in the development of unipolar depression.

If a Study Showed That Both Monozygotic Twins Had About