A man of genotype Iᴬi marries a woman of genotype Iᴮi. What is the probability that their child has blood group O?
Correct answer A. 1/4
Explanation
Gametes Iᴬ or i × Iᴮ or i give IᴬIᴮ, Iᴬi, Iᴮi and ii in equal proportions, so P(ii, group O) = 1/4.
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