If two persons with 'AB' blood group marry and have a sufficiently large number of a children, these children could be classified as 'A' blood group. 'AB blood group 'B' blood group in 1:2:1 ratio.
The modern technique of protein electrophoresis reveals the presence of both 'A' and 'B' type proteins in 'AB' blood group individuals. This is an example of

Codominance

Incomplete dominance

Partial dominance

Compelete dominance

Solution

Codominance

AB blood group is characterised by the presence of both antigen A and B i.e. I^A and I^B over the surface of RBCs.

$Phenotype AB ↓ Genotype I^{A} I^{B} ↓ Antigen A + Antigent B$

Here both alleles are able to express themselves forming antigens A and B. This is called as codominance.

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