PATHOLOGY

Detailed explanation-1: -Three alleles control the expression of ABO blood groups in humans.

Detailed explanation-2: -The ABO blood typing system in humans is determined by a single locus with three alleles A, B, and O.

Detailed explanation-3: -The A, B, AB and O blood group types in humans are determined by three alleles of a gene. The gene I, which determines the blood type, exists in three allelic forms, which are IA, IB and i.

Detailed explanation-4: -When a trait has three or more distinct alleles, we refer to it as having multiple alleles inheritance. The human ABO blood type alleles/trait is an example of a trait with multiple alleles. Three distinct alleles exist: allele A (IA), allele B (IB), and allele i (IO or i).

Detailed explanation-5: -Blood Type Is Determined Genetically The A allele codes for an enzyme that makes the A antigen, and the B allele codes for an enzyme that makes the B antigen. A third version of this gene, the O allele, codes for a protein that is not functional; it makes no surface molecules at all.