Incomplete Dominance Gene Interaction - In incomplete dominance, alleles may produce the same product, but in lesser quantity as compared with the dominant allele. In heterozygous condition, the total product is intermediate between that of the dominant and recessive alleles.

The phenotypic ratio is 1: 2: 1. For example, in snapdragons, the homozygous dominant for flower colour will show red colour and homozygous recessive will be white. In contrast, the heterozygous will have pink colour.

This is against Mendel's theory of dominance, as a heterozygous plant should show the characteristic of dominant, i.e., red.