ABO blood system is an example of:

Explanation

Option B is correct. The ABO blood system is an example of multiple alleles. Multiple alleles are different forms of the same gene. In the case of the ABO blood system, the gene is called ABO, and it has three alleles: A, B, and O. The A allele is responsible for the production of the A antigen in red blood cells. The B allele is responsible for the production of the B antigen in red blood cells. The O allele is responsible for the production of neither antigen on red blood cells. A person's blood type is determined by the alleles they inherit from their parents. If a person inherits two A alleles, they will have type A blood. If a person inherits two B alleles, they will have type B blood. If a person inherits one A allele and one B allele, they will have type AB blood. And if a person inherits two O alleles, they will have type O blood. Multiple alleles are a common occurrence in human genetics. Other examples of multiple alleles include the Rh blood group system, the MN blood group system, and the sickle cell anemia gene.