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Study the following pedigree chart of a family, starting with mother with AB blood group and father with O blood group.

(a) Mention the blood group as well as its genotype of the offspring numbered 1 in generation II. 

(b) Write the possible blood groups as well as their genotypes of the off springs numbered 2 and 3 in generation III. 

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1) Blood group B;            Genotype  -  IB

(2) Blood group  =  A; Genotype  =  IA

(3) Blood group -  'AB'   IAIB The allele IA produces glycoprotein A, found on the surface of red blood cells. 

The allele IB produces glycoprotein B, found on the membrane of red blood cells. 

When the alleles IA and IB are together, they are equally dominant and both the glycoproteins A and B are produced. 

The blood group is determined by the presence or absence of one or both the glycoprotein i.e., group A, B and AB, while group O has neither of them.

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