NEETZoologyBody Fluids and Circulation
A man with blood group AB marries a woman, and they have a child with blood group B. Which of the following genotypes cannot possibly belong to the mother?
Options
- AI^A i
- BI^A I^A
- CI^B i
- Dii
Correct answer
B. I^A I^A
Step-by-step solution
The father has blood group AB, so his genotype is I^A I^B . He can pass on either the I^A or I^B allele to his offspring. The child has blood group B, which means the child's genotype must be either I^B I^B or I^B i . Since the child must inherit one allele from each parent, and the father can provide the I^B allele, the mother must provide either an I^B allele (for an I^B I^B child) or an i allele (for an I^B i child). Therefore, the mother's genotype must contain at least one I^B or i allele. A mother with the ge