If a trait is highly heritable, it would be expected that the concordance rate for ________
A) dizygotic twins and monozygotic twins would be comparable.
B) dizygotic twins would be greater than the concordance rate for monozygotic twins.
C) monozygotic twins would be greater than the concordance rate for dizygotic twins.
D) dizygotic twins would be close to 100 percent.

Question

Quizplus · Accepted Answer

If a trait is highly heritable, it means that it is largely influenced by genetic factors. In this case, the concordance rate for monozygotic twins (who share 100% of their genetic material) would be expected to be greater than the concordance rate for dizygotic twins (who share, on average, 50% of their genetic material). Therefore, the best choice is C, which states that the concordance rate for monozygotic twins would be greater than the concordance rate for dizygotic twins.

If a Trait Is Highly Heritable, It Would Be Expected