Which statement describes the difference between incomplete dominance and codominance? In codominance, only one allele is expressed in the offspring; In incomplete dominance, both alleles are expressed in the offspring. In codominance, both allels are expressed in the offspring; In incomplete dominance, only one allele is expressed in the offspring. In codominance, both alleles are expressed in the offspring; in incomplete dominance, the offspring demonstrate an intermediate form of the alleles from the parents. In codominance, the offspring demonstrate an intermediate form of the alleles from the parents; in incomplete dominance, both alleles are expressed in the offspring.