NEET2026BiologyChapterActual
A child is born with the blood group 'AB'. Which of the following combinations of parental genotypes is NOT possible for this couple?
Options
- AI^A i and I^B i
- BI^A I^B and ii
- CI^A I^A and I^B i
- DI^A I^B and I^A I^B
Correct answer
B. I^A I^B and ii
Step-by-step solution
The child has blood group 'AB', which corresponds to the genotype I^A I^B . For a child to have the genotype I^A I^B , one parent must contribute the I^A allele and the other parent must contribute the I^B allele. In the combination I^A I^B and ii , the parent with genotype ii can only produce gametes containing the i allele. Therefore, the child will necessarily inherit an i allele from this parent. The possible genotypes for the offspring of this couple are I^A i (blood group A) and I^B i (blood group B). It is i