3. What is the key to the recognition of codominance?
(A) The phenotype of the heterozygote falls between the phenotypes of the homozygotes.
(B) The trait exhibits a continuous distribution.
(C) The alleles affect more than one trait.
(D) The dominant allele is not always expressed.
(E) The heterozygote expresses the phenotype of both homozygotes.
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