What is incomplete dominance ? Learn incomplete dominance definition, mechanisms, examples, and more. Test your knowledge - Incomplete Dominance Biology Quiz! Incomplete dominance is a type of genetic interaction where neither allele completely masks the effect of the other . In simple terms, when an organism has two different alleles for a trait, the resulting phenotype is an intermediate blend of the two. Incomplete dominance refers to a condition where a heterozygous individual does not exhibit the dominant allele but instead shows a phenotype that is intermediate between the phenotypes of the dominant and recessive alleles. It is also known as partial dominance or intermediate inheritance. What is incomplete dominance , and how does it work. Check out a few examples with diagrams. Learn incomplete dominance Punnett square.