Simran Vinaik
Last Activity: 7 Years ago
Incomplete dominance is when one allele is not completely dominant over the other. The two alleles together encode protein thus give a blended phenotype.
In incomplete dominance the F2 generation has same phenotype and Genotype ratio- 1:2:1.
Best example is Snapdragon and Mirabilis jalapa.The F1progeny from a cross of red and white flowered Mirabilis jalapa (four o’ clock plant) bear pink flowers. This would then give rise to red, pink, and white flowered plants in 1: 2: 1 ratio in F2generation.
Similarly in Snapdragon (Antirrhinum majus) plants with broad leaves and plants with narrow leaves give rise to plants with intermediate leaves in F1generation and 1 broad, 2 intermediate, and 1 narrow leaved plants in F2generation.
