If we say that bipolar disorder has a concordance rate of 85 percent in monozygotic twins, we mean that
A) 85 percent of the time bipolar disorder is the result of genetic influences shared by monozygotic twins.
B) if one monozygotic (identical) twin has bipolar disorder, his or her twin has an 85 percent chance of being diagnosed with the disorder as well.
C) 85 percent of the time, bipolar disorder cannot be explained by genetic variables, even in monozygotic twins.
D) a parent with bipolar disorder has an 85 percent chance of passing the disorder to his or her monozygotic twins.

Question

Quizplus · Accepted Answer

The concordance rate of 85 percent in monozygotic twins means that if one twin has bipolar disorder, there is an 85 percent chance that the other twin will also be diagnosed with the disorder. This suggests a strong genetic component to the disorder.

If We Say That Bipolar Disorder Has a Concordance Rate