What role do codominant alleles play in determining phenotypes?

If the alleles are different, the dominant allele usually will be expressed, while the effect of the other allele, called recessive, is masked. In codominance, however, neither allele is recessive and the phenotypes of both alleles are expressed.

Explanation:

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1. b.

2. d.

3. a.

5. d.

6. c.

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