What is incomplete dominance? Explain with examples.

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.