If for a given trait both members of a twin pair express the trait, they are ________.Group of answer choicesconcordantdiscordantbicordantacordant

Answer: Concordant

In the context of twin studies and genetics, the term "concordant" is used to describe a situation where both members of a twin pair express the same trait. In contrast, "discordant" refers to cases where one twin expresses the trait while the other does not. Therefore, when both twins share a trait, they are termed "concordant." This concept is especially relevant in studies examining the heritability of traits and the influence of genetics versus environment. The other terms provided—bicordant and acordant—are not standard terms used in this context.