An incomplete dominance Punnett square is a diagram that predicts the outcome of genotype as well as phenotype in organisms. With incomplete dominance, the dominant allele in a heterozygote is only partially expressed, which results in an intermediate phenotype.
A common example of incomplete dominance is a snapdragon plant that has no dominant allele. If the snapdragon plant is homozygous for the red allele, it has red flowers. If the snapdragon plant is homozygous for the white allele, it has white flowers. However, if the snapdragon plant is a heterozygote, with both red and white alleles, it has pink flowers.