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 in an example of

A partial dominance
B complete dominance
C codominance
D incomplete dominance.

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Answer & Solution

Correct Answer

(C) codominance

Step-by-step Solution

Detailed explanation

(c) : The phenomenon of expression of both the alleles in a heterozygote is called codominance. The alleles which do not show dominancerecessive relationship and are able to express themselves independently when present together are called codominant alleles. As a result the heterozygous condition has a phenotype different from either of homozygous genotypes, \(e.g.\), alleles for blood group \(A\ (I^A)\) and for blood group \(B\ (I^B)\) are codominant so that when they come together in an individual, they produce blood group \(AB\).

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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