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A child of blood group O cannot have parents of blood groups

1. AB and AB/O
2. A and B
3. B and B
4. O and O

Correct answer: AB and AB/O

Solution

Blood group O has genotype OO, so each parent must contribute an O allele. A parent with blood group AB has genotype AB and cannot pass on an O allele, so an O child cannot come from an AB parent. Therefore the pair AB and AB/O cannot produce a child with blood group O.

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