Question

What will be the genotype of parents of a child with 'O' blood group?

• A. $I^A{I}^A\times I^A{I}^A$
• B. $I^B{I}^B\times I^B{I}^B$
• C. $I^A{I}^A\times I^B{I}^B$
• D. $I^{A}i\times I^{B}i$

Answer 1

The correct option is D $I^{A}i\times I^{B}i$

A parent donates one of the three I${}^A$I${}^B$i alleles to child. If child is having O blood group, the genotype of the child will be ii. In this case, child has acquired allele i from each of the parent. Parents with blood group I${}^A$i and blood group I${}^B$i will donate their i allele to their child resulting in O blood group of child.

Thus, the correct answer is option D.