Question

blood types
the four blood types in the abo blood type system are type a, type b, type ab, and type o. these blood types refer to different versions of carbohydrate molecules which are present on the surface of red blood cells. these blood types result from 3 different alleles of a gene as shown in the following table. because blood types are determined by more than 2 alleles, they are an example of: . (p. 304)

Explanation:

In genetics, when a trait (like blood type in the ABO system) is determined by more than two alleles of a single gene, this is called multiple alleles. The ABO blood type is controlled by three alleles ($I^A$, $I^B$, and $i$), so it's an example of multiple alleles.

Answer:

multiple alleles