The ABO Blood Types are an Example of ____

Question

The ABO blood types are an example of ____.  
A) pleiotropy and polygenic inheritance
B) multiple alleles and continuous variation
C) incomplete dominance
D) codominance and epistasis
E) multiple alleles and codominance

Accepted Answer

The ABO blood types are determined by multiple alleles, meaning there are three possible versions of the gene that determine an individual's blood type (A, B, or O). Codominance is also present because both A and B alleles can be expressed simultaneously in individuals with AB blood type.