Suppose that a disease is inherited. Your mother has the disease, your father does not, and you have a very minor case of the disease which lies somewhere in between your mother's and father's situation. In this case, we would know that the alleles that determine this trait:
A) are recessive
B) are dominant
C) are codominant
D) are heterozygous

Question

Quizplus · Accepted Answer

In this scenario, the alleles must be codominant, meaning that both alleles are expressed equally in the phenotype. This is because the offspring has a mild case of the disease, which indicates that both the dominant and recessive alleles are expressed in the phenotype. If the alleles were dominant or recessive, the offspring would either have the disease or not have it at all. Heterozygous refers to the genotype of the individual, and does not describe the nature of the alleles.

Suppose That a Disease Is Inherited