A significantly higher concordance rate for a trait in MZ twins indicates that may be important in the expression of that trait.
A) the environment
B) pleiotropy
C) genetic factors
D) the house in which the twins were raised

Question

Quizplus · Accepted Answer

A concordance rate is the probability that both twins exhibit a trait if one twin exhibits the trait. MZ twins have identical genetic makeup, and thus a higher concordance rate suggests that the trait is strongly influenced by genetic factors rather than the environment or upbringing. Pleiotropy refers to the phenomenon where a single gene affects multiple traits, but it does not necessarily explain a higher concordance rate in MZ twins. The house in which the twins were raised may have some influence on the expression of a trait, but it would not explain why MZ twins have a higher concordance rate compared to fraternal twins.

A Significantly Higher Concordance Rate for a Trait in MZ