Question

In the previous scenario, you looked closely at the effect of dominance and recessive genes. In this scenario, we will look at codominance. Codominance means that the alleles inherited from the parent gene are both dominant. Thus, the traits from both alleles are expressed. Look at the example below, we have one brown parent (RR) and one white parent (WW). All the offspring are White with Brown spots (RW).

Answer 1

Codominance, as stated in the text, refers to the expression of both alleles. Thus, codominance requires two things: heterozygous genotype, and phenotypic mosaicism. Phenotypic mosaicism refers to a pattern in which a living being has traits from two different alleles. In this example, cows are neither brown, nor white, but it has spots of both colors. The Punnet square provided shows codominance, as it has only heterozygous cows, a requisite for codominance allele classification.