The inheritance of flower colour in the dog flower (snapdragon or Antirrhinum sp.) is a good example which shows incomplete dominance. In a cross between true-breeding red-flowered (RR) and true-breeding white-flowered plants (rr), the F1 (Rr) was pink. When the F1 was self-pollinated the F2 resulted in the following ratio, 1(RR) Red : 2(Rr) Pink: 1 (rr) White. Here the genotype ratios were 1: 2 I as in any Mendelian monohybrid cross, but the phenotype ratios had changed from the 3: 1 dominant recessive ratio to 1: 2: 1 .