Which of the Following Sets of Individuals Had the Highest

question 33

Multiple Choice

Which of the following sets of individuals had the highest concordance for MDD and what does that tell us?

• A) Monozygotic twins raised together had only slightly higher concordance for MDD than monozygotic twins raised apart. This indicates a strong genetic component to the disorder.
• B) Monozygotic twins raised together had a higher concordance for MDD than monozygotic twins raised apart. This indicates the importance of nonshared environmental factors as primary in the development of the disorder.
• C) Dizygotic twins have a higher concordance rate for MDD than monozygotic twins, whether raised together or raised apart. This indicates there is a strong genetic component to the disorder.
• D) Twins had to have been raised together to show any concordance for MDD above that of typical siblings. This indicates a relatively small genetic role in MDD.