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

1. incomplete dominance
2. Partial dominance
3. Complete cominance
4. Codominance

Correct answer: Codominance

Solution

Codominance occurs when both alleles of a gene have an equal effect on the phenotype, resulting in the presence of both 'A' and 'B' type proteins in 'AB' blood group individuals.

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