Multiple choice

How many possible phenotypes are there for the ABO blood type system?

  1. 3

  2. 4

  3. 5

  4. 6

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The ABO blood type system has three alleles (I-A, I-B, i), which result in four distinct phenotypes: Type A, Type B, Type AB, and Type O.