A child of blood group ‘O’ cannot have parents of blood groups ____________.

A and B

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AB and O

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O and O

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A and A

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Solution

The correct option is B AB and O
Parents with blood groups A and B, A and A, O and O can have a child with blood group O. Parents with blood groups AB and O can never have a child with blood group O. The crosses are given below:

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