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Q.

A gene showing codominance has

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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

answer is B.

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Detailed Solution

A gene showing codominance has both alleles independently expressed in the heterozygote.

Example:

The IA and  IB alleles of the gene I are co-dominant to each other. When IA and IB are present together they both express their own types of sugars: this is because of co-dominance. Hence red blood cells have both A and B types of sugars.

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