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A gene showing codominance has:

1. alleles tightly linked on the same chromosome
2. alleles that are recessive to each other
3. both alleles independently expressed in the heterozygote
4. one allele dominant on the other

Correct answer: both alleles independently expressed in the heterozygote

Solution

In codominance, both alleles in a heterozygote are fully and independently expressed, so both traits appear. This differs from dominance, where one allele masks the other, and from recessiveness, where an allele is hidden in the heterozygote.

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