What is incomplete dominance?

incomplete dominance — The situation in which both alleles of a heterozygote influence the phenotype. The phenotype is usually intermediate between the two homozygous phenotypes. The situation in which a heterozygote shows a phenotype somewhere (but not exactly half-way) intermediate between the corresponding homozygote phenotypes. (Exact intermediacy is no dominance.) See also dominance, codominance and recessivity.