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Question

A child with blood group ‘O’ cannot have either parents of the blood group:

A
B and O
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B
A and O
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C
AB
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D
A and B
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Solution

The correct option is C AB
The child's blood group is ‘O’ which means there is no antigen A or B on the RBC surface. The child has to inherit the allele for O group from both its parents. Hence, all the above given combinations of parents are possible except AB, because AB individuals always contribute either A or B antigen to the offspring.

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