In the Universal ABO Blood Grouping System,there Are Four Phenotypes

Multiple Choice

In the universal ABO blood grouping system,there are four phenotypes: A,B,AB,and O.Various populations have different frequencies of these four phenotypes but,in most populations O is most common and AB least common.The ABO blood grouping system exemplifies

A) polymorphism.
B) genetic drift.
C) the bottleneck effect.
D) the Red Queen effect.
E) the founder effect.