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The genotype of B-group father of an O-group child is

1. IᴮIᴼ
2. IᴮIᴮ
3. IᴬIᴮ
4. IᴼIᴮ

Correct answer: IᴮIᴼ

Solution

An O-group child has genotype IᴼIᴼ, so the father must contribute an Iᴼ allele. A B-group father can be IᴮIᴮ or IᴮIᴼ, but only IᴮIᴼ carries an O allele to pass on. Therefore, the father’s genotype is IᴮIᴼ.

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