Human ABO blood type is controlled by the I locus and has three possible alleles. The alleles which code for type A blood (IA) and type B blood (IB) are codominant, while the allele for type O blood (i) is recessive. In a cross between a person with a genotype of IAi and a person with genotype IAIB, what is the probability of having three offspring with type A blood?
A. 1
B. 1/2
C. 1/4
D. 1/8
E. 1/16
Answer: D. 1/8
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