ABO blood grouping is controlled by gene I which has three alleles and shows co-dominance. There are six genotypes. How many phenotypes in all are possible?
| 1. | three | 2. | four |
| 3. | five | 4. | six |
Mother and father of a person with ‘O’ blood group have ‘A’ and ‘B’ blood group, respectively. What would be the genotype of both mother and father?
| 1. | Mother is homozygous for ‘A’ blood group and father is heterozygous for ‘B’ |
| 2. | Mother is heterozygous for ‘A’ blood group and father is homozygous for ‘B’ |
| 3. | Both mother and father are heterozygous for ‘A’ and ‘B’ blood group, respectively |
| 4. | Both mother and father are homozygous for ‘A’ and ‘B’ blood group, respectively |
In a marriage between a male with blood group A and a female with blood group B, the progeny had either blood group AB or B. What could be the possible genotype of parents?
| 1. | IA i (Male) ; IB IB (Female) |
| 2. | IA IA (Male) ; IB IB (Female) |
| 3. | IA IA (Male) ; IB i (Female) |
| 4. | IA i (Male) ; IB i(Female) |