Higher concordance for monozygotic twins compared with that for dizygotic twins indicates that genetic factors play a role in determining differences in a trait. Low concordance for monozygotic twins indicates that environmental factors play a significant role.
-A trait exhibits 100% concordance for both monozygotic and dizygotic twins. What conclusion can you draw about the role of genetic factors in determining differences in the trait?
A) Genetic factors are extremely important.
B) Genetic factors are somewhat important.
C) Genetic factors are unimportant.
D) Both genetic and environmental factors are important.

Question

Quizplus · Accepted Answer

If a trait exhibits 100% concordance for both monozygotic and dizygotic twins, it suggests that genetic factors are unimportant, as both types of twins show the same level of concordance, indicating that environmental factors are likely responsible for the trait.

Higher Concordance for Monozygotic Twins Compared with That for Dizygotic