A gene showing codominance has

A alleles that are recessive to each other
B both alleles independently expressed in the heterozygote
C one allele dominant on the other
D alleles tightly linked on the same chromosome.

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Answer & Solution

Correct Answer

(B) both alleles independently expressed in the heterozygote

Step-by-step Solution

Detailed explanation

(b) : 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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