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Sharon and Shauna are monogotic twins. They both have blonde hair, but Sharon has green eyes...

Sharon and Shauna are monogotic twins. They both have blonde hair, but Sharon has green eyes and Shauna has blue eyes.

Sharon and Shauna are ____ for eye color.

Select one:

a. Concordant

b. Discordant

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Answer #1

Monozygotic twins are twins that are formed by splitting of one embryo/zygote during embryonic development. They have the same set of genes and should inherit same phenotypes. Thys, monozygotic twins are genotypically identical.

Sharon and Shauna thus will have the same genotype and are identical twins. Concordant expression indicates that the trait should have same expression in both girls. Discordant expression indicates that the trait is differently expressed in the two girls. Sharon and Shauna show different eye colors, despite having the same genes. Sharon has green eyes while eye color in Shauna is blue. Hence, their phenotypic expression of eye color trait differs. This is discordant trait. The same blond hair color in the twins is a concordant expression.

Right choice: b. Discordant.

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