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NEET2026ZoologyPrinciples of Inheritance and VariationActual

For a person with blood group ‘O’, which of the following is not a possible combination of parents' blood group genotypes ?

Options

  1. AFather : I^A I^B and Mother : I^A i
  2. BFather : I^A i and Mother : I^B i
  3. CFather : I^A i and Mother : I^A i
  4. DFather : I^B i and Mother : I^B i

Correct answer

A. Father : I^A I^B and Mother : I^A i

Step-by-step solution

Blood group 'O' corresponds to the homozygous recessive genotype ii . For a child to have blood group 'O', they must inherit one i allele from each parent. This means both parents must possess at least one i allele in their genotype. In the combination Father : I^A I^B and Mother : I^A i , the father does not have an i allele. Therefore, he can only pass either an I^A or an I^B allele to the offspring. As a result, it is impossible for this couple to produce a child with the ii genotype (blood group 'O'). In all ot

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