Express the genotype of AB blood group?

Blood group is a genetically inherited trait. ABO blood groups are controlled by gene I. The gene I has three alleles IA, IB and i. Blood group is determined by these three factors. 4 types of blood group can be formed by these alleles and they are: 

1. Blood group A in which the allelic combination is either IAIA or IAi. 

2. Blood group B in which the allelic combination is either  IIB or  IBi. 

3. Blood group AB in which the allelic combination is IAIB

4. Blood group O in which the allelic combination is ii. An individual inherits one allele from father and other from the mother. 

@Others...Good work..Keep posting!

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IAIB

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they both can be homozygous or heterozygous. For A blood type, can be IAIA or IAIO. And for B blood type, can be IBIB or IBIO.

U can modify according to the genotypes above.

For AB blood type, the only possible genotype is IAIB.

Good luck...I already gave u the hints.

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