Question -
Answer -
A set of three alleles – IA, IB and i control the blood group characteristics in humans. Where alleles IA and IB are equally dominant and allele i is recessive to the other alleles. The table below depicts the genotypes and blood group.
| Individuals with Genotype | Blood group they would possess |
| IA, IA, IA, i | A |
| IB,IB, IB, i | B |
| IA, IB | AB |
| ii | O |
Thus, if father has blood group A and mother has blood group B, then the possible genotype of the parents will be as follows:
A cross between heterozygous parents willproduce progenies with AB blood group (IA IB) and Ogroup (ii)
