ABO blood typing is an example of multiple alleles in the expression of a trait.
Here's an explanation to support this answer:
1. Multiple alleles refer to the existence of more than two alleles (different forms of a gene) for a particular trait in a population. In the case of blood typing, the ABO blood group system involves three alleles: IA, IB, and i.
2. Alleles IA and IB are codominant, meaning they are expressed equally when present together. This leads to the different blood types (A, B, AB) depending on which alleles an individual inherits.
3. The IA and IB alleles are dominant over the i allele (which is recessive), resulting in the expression of the A or B blood type when present.
Therefore, ABO blood typing exemplifies multiple alleles because it involves more than two possible forms of a gene (IA, IB, i) determining the ABO blood groups (A, B, AB, O) through codominance and dominance relationships.
