Incomplete
   Dominance

   Neither  allele  in  snapdragon  flower  color  is  dominant. The F[1]
   generation exhibits an intermediate phenotype.

   The  genotypic  ratio  (1:2:1)  of the F[2] 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  R^2  allele produces no pigment; a heterozygote produces
   half as much pigments as the homozygous R^1 and appears pink.