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

Explanation

"When the alleles are in heterozygous condition, the dominant gene fails to suppress the recessive gene completely and produce a new trait which is different from their parents".
The phenotype of `F_1` generation does not resemble either of the two parents and the expression is in between the two. Inheritance of flower colour in the dog flower or snapdragon (Antirrhinum sps.) is a good example for incomplete dominance. In a cross between true breeding red flowered (RR) plant and true breeding white flowered (rr) plants, the `F_1` hybrids produce pink coloured flowers (Rr). When the `F_1` hybrids are self pollinated (self cross), the `F_2` generation resulted in the ratio of 1:2:1[1Red (RR) : 2 Pink (Rr): 1White (rr)]. Here, the phenotype ratio does not resemble the Mendelian monohybrid cross but the genotype ratio is exactly similar to that of Mendelian monohybrid cross.