Father and mother having A and B blood group respectively

cannot give birth to child with AB blood group

cannot give birth to child with O blood group

can give birth to child with O blood group

cannot give birth to twin child with B blood group

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Answer is Wrong!

This question was previously asked in

UPSC CAPF – 2011

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A father and mother having A and B blood groups respectively can give birth to a child with O blood group.

Blood group A can have genotypes I^A I^A or I^A i, and blood group B can have genotypes I^B I^B or I^B i. A child with blood group O has the genotype ii. This genotype can only be formed if both parents contribute an ‘i’ allele.

If the father has genotype I^A i (Blood Group A) and the mother has genotype I^B i (Blood Group B), their possible offspring genotypes are I^A I^B (AB), I^A i (A), I^B i (B), and ii (O). Therefore, a child with blood group O is a possible outcome if both parents are heterozygous for their respective blood groups.

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