What is incomplete dominance? Explain inheritance of flower colour in snapdragon

Explanation

It is a condition in heterozygous individuals in which the dominant gene fails to suppress the recessive gene completely and undergoes blending to produce a new trait which differs from their parents.
The incomplete dominance was observed by Carl Correns of Germany during hybridization experiments in Antirrhinum majus (Snapdragon). He crossed pure breeding red flowering plants (RR) with pure breeding white flowering plants (rr) and obtained all heterozygous pink flowering plants (Rr) in `F_(1)` generation. Then he self pollinated the `F_(2)` pink flowering plants obtained the plants in the phenotypic and genotypic ratio of 1:2:1 in `F_(2)` generation as follows
The Phenotypic and Genotypic ratio of monohybrid cross (incomplete dominance) is 1:2:1 [I(RR) Red: 2 (Rr) Pink: 1 (rr) White].