Biology - Principles of Inheritance and Variation Question with Solution | TestHub

Blood group O requires the genotype $I^0{I}^0$.

For a child to have blood group O, both parents must contribute an $I^0$ allele.

Parents with the genotype $I^A{I}^B$ do not possess the $I^0$ allele. Therefore, they can only produce offspring with blood groups A, B, or AB (genotypes $I^A{I}^A$, $I^B{I}^B$, or $I^A{I}^B$).

Thus, parents with genotypes $I^A{I}^B{\text{Rh}}^{+ve}$ and $I^A{I}^B{\text{Rh}}^{+ve}$ cannot have a child with blood group O.

Answer: $I^A{I}^B{\text{Rh}}^{+ve}$ and $I^A{I}^B{\text{Rh}}^{+ve}$