Question

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multiple-choice question
what is the difference between incomplete dominance and codominance?
in codominant traits both alleles are expressed, while in incompletely dominant traits the alleles mix to create a 3rd
variation of the trait.
the dominant allele completely masks the recessive allele.
in codominance the traits are mixed, in incomplete dominance the traits are both expressed.
rewatch

Explanation:

To determine the correct answer, we analyze the concepts of incomplete dominance and codominance:

• In codominance, both alleles are fully expressed (e.g., a chicken with both black and white feather alleles showing both colors).
• In incomplete dominance, alleles blend to form a new phenotype (e.g., a pink flower from red and white alleles).

Now, evaluate the options:

1. "In codominant traits both alleles are expressed, while in incompletely dominant traits the alleles mix to create a 3rd variation of the trait." – This matches the definitions.
2. "The dominant allele completely masks the recessive allele." – This describes complete dominance, not the difference between incomplete and codominance.
3. "In codominance the traits are mixed, in incomplete dominance the traits are both expressed." – This swaps the definitions, so it's incorrect.

Answer:

A. In codominant traits both alleles are expressed, while in incompletely dominant traits the alleles mix to create a 3rd variation of the trait.