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Incomplete dominance means that alleles for the genes are neither:

  1. Dominant nor dominant

  2. Dominant nor deleted

  3. Dominant nor recessive

  4. Recessive nor expressive

The correct answer is: Dominant nor recessive

Incomplete dominance means that neither allele for the gene is completely dominant over the other, resulting in a heterozygous individual expressing a phenotype that is a blend of both alleles. Option A is incorrect because it repeats the use of the word "dominant", which would not make sense in a definition of incomplete dominance. Option B is incorrect because "deleted" is not a fitting word to use in this context. Option D is incorrect because it introduces the word "expressive", which is unrelated to dominance.