Q.

A gene showing codominance has

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a

alleles tightly linked on the same chromosome

b

one allele dominant on the other

c

alleles that are recessive to each other

d

both alleles independently expressed in the heterozygote

answer is B.

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Detailed Solution

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If a gene shows codominance, its both alleles are independently expressed in the heterozygote.
(1) Alleles are codominant to each other.
(3) One allele is not dominant over the other.
(4) Alleles are not linked. They are present on different homologous chromosomes but at the same locus.

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