Neither allele in snapdragon flower color is dominant. The F₁ generation exhibits an intermediate phenotype.

The genotypic ratio (1:2:1) of the F₂ generation is identical to that of Mendel's monohybrid cross, but the phenotypic ratio is identical to the genotypic ratio.

These phenotypes are due to the production of a red pigment by the R enzyme; the R² allele produces no pigment; a heterozygote produces half as much pigments as the homozygous R¹ and appears pink.