Question

what is codominance?
a type of inheritance in which the trait is controlled by three or more pairs of alleles.
a type of inheritance in which the dominant allele is not completely expressed in the heterozygous genotype.

Explanation:

Codominance is a type of inheritance where both alleles in a heterozygous genotype are fully expressed, not a situation where a trait is controlled by multiple - allele systems (first option) nor incomplete dominance (second option).

Answer:

Neither of the provided options is correct. Codominance is a type of inheritance in which both alleles of a gene pair in a heterozygous individual are fully expressed, resulting in a phenotype that shows characteristics of both alleles.