AP Biologymediummcq1 pt
Human ABO blood groups are controlled by three alleles (Iᴬ, Iᴮ, i). How many genotypes are possible?
A.6
B.3
C.4
D.9
Explanation
Core Concept
Two of three alleles combine: IᴬIᴬ, Iᴬi, IᴮIᴮ, Iᴮi, IᴬIᴮ, ii — six genotypes producing four phenotypes (A, B, AB, O).
Correct Answer
A6
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