Question

Which statements describe codominance? Select three options.

Answer 1

Hello. This question is incomplete. The complete question would be:

"Which statements describe codominance? Select three options. Traits are usually dominant. Traits are neither dominant nor recessive. Offspring exhibit an intermediate form of alleles from the parents. Both alleles, one from each parent, are expressed in offspring. Codominance involves the interaction of two alleles. "

Answer:

• Traits are neither dominant nor recessive.
• Both alleles, one from each parent, are expressed in offspring.
• Codominance involves the interaction of two alleles.

Explanation:

Codominance occurs when both alleles express themselves in heterozygosis and, unlike incomplete dominance, no intermediate phenotype is formed. In this case, the phenotype presents characteristics of the two alleles, which are active and independent of each other.

In summary, we can state that codominance is characterized by:

• Traits are neither dominant nor recessive.
• Both alleles, one from each parent, are expressed in offspring.
• Codominance involves the interaction of two alleles.

The best known example of codominance is the ABO system, which has three involved alleles (IA, IB and i). There is a dominance relationship between alleles IA and i, and IB and i, however, between IA and IB this relationship is not observed. Genotypes IAi and IAIA determine A blood, genotypes IBi and IBIB determine B blood, and ii determine O blood. When the individual has IAIB blood, the blood is AB because both alleles are expressed and there is no relationship of dominance between them.

Answer 2

Codominance is a relationship between two versions of a gene. Individuals receive one version of a gene, called an allele, from each parent. If the alleles are different, the dominant allele usually will be expressed, while the effect of the other allele, called recessive, is masked.