Suppose a researcher is studying twins where at least one twin suffers from depression. The researcher finds that both twins are much more likely to share the disorder if they are monozygotic and not dizygotic twins. What should the research conclude?
A) depression is entirely genetic
B) the heritability of depression is high
C) the heritability of depression is low
D) monozygotic twins are at a higher risk for depression than non-twins

Question

Quizplus · Accepted Answer

The research concludes that the heritability of depression is high, as the fact that monozygotic twins are more likely to share the disorder than dizygotic twins suggests that genetics play an important role in the development of depression. However, it does not mean that depression is entirely genetic, as other factors could also be involved.

Suppose a Researcher Is Studying Twins Where at Least One