Question

multiple-choice question which of these best describes incomplete dominance? when the dominant allele covers up the recessive allele. when the dominant allele does not completely cover up the recessive allele and they mix creating a third phenotype. when both the dominant and recessive allele express a phenotype (like spots).

Explanation:

To determine the correct description of incomplete dominance, we analyze each option:

• The first option ("When the dominant allele covers up the recessive allele") describes complete dominance, not incomplete dominance.
• The second option ("When the dominant allele does NOT completely cover up the recessive allele and they MIX creating a third phenotype") matches the definition of incomplete dominance, where neither allele is fully dominant, and a new phenotype (a blend) is produced.
• The third option ("When both the dominant and recessive allele express a phenotype (like spots)") describes codominance, where both alleles are expressed simultaneously without blending.

Answer:

The correct option is: When the dominant allele does NOT completely cover up the recessive allele and they MIX creating a third phenotype.