Which of the following represents the interaction between two different alleles for the same trait?

The interaction between two different alleles for the same trait can indeed be represented by codominance. In codominance, both alleles are expressed equally in the phenotype of the organism. This means that when an individual carries two different alleles for a specific gene, neither allele is dominant over the other, and the traits associated with both alleles are fully manifested. A classic example of codominance can be seen in blood types, such as the AB blood type, where both the A and B alleles are equally expressed.

While complete dominance and incomplete dominance also describe interactions between alleles, they do so in different ways. In complete dominance, one allele completely masks the effect of the other, resulting in a phenotype that only shows the dominant trait. In incomplete dominance, the phenotype is a blend of the two alleles, leading to a mixed or intermediate trait. Oligogenic inheritance, on the other hand, refers to traits controlled by multiple genes rather than the interaction of alleles at a single locus, and therefore does not apply to this context.