AP BIOLOGY

Detailed explanation-1: -Codominance. In people, one codominant trait that you can’t really observe by looking at a person, but many people know about themselves, is blood type. People with the AB blood type have one A allele and one B allele. Because both alleles are expressed at the same time, their blood type is AB.

Detailed explanation-2: -The AB heterozygote at the classical blood type locus (the ABO locus) expresses both the A and B blood type antigens and has been considered as a classical case of codominance.

Detailed explanation-3: -In the ABO blood type system in humans, blood type AB is an example of codominance. It implies that both dominant alleles are present and expressed together.

Detailed explanation-4: -Unlike incomplete dominance, where the two parent phenotypes are blended together into a new phenotype, in codominance, both parent phenotypes show up together on the offspring. The most common example of codominance is the AB blood type.

Detailed explanation-5: -Incomplete genetic dominance is similar to but different from co-dominance. Whereas incomplete dominance is a blending of traits, in co-dominance an additional phenotype is produced and both alleles are expressed completely. The best example of co-dominance is AB blood type inheritance.