Multiple choice

How many different alleles make up the blood types?

  1. 1

  2. 2

  3. 3

  4. 4
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The ABO blood type system is controlled by three alleles: I-A, I-B, and i. These alleles interact to produce the four possible blood types (A, B, AB, and O).

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