What should be the blood types of parents if their children can have only A and B types of blood
AB and A
A and O
A and B
AB and O
A
A and O
B
AB and O
C
AB and A
D
A and B
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Solution
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If children have A and B blood groups this means that their genotypes are IA/IA or IA/IO for A child and IB/IB or IB/IO for B child. These two blood groups can be formed only if parents have genotypes IA/IB and IO/IO. The cross between these two genotypes of parents can only give rise to children with both A and B blood groups.
IA/IB X IO/IO
IA/IO and IB/IO
So, the correct answer is 'AB and O'
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