INCOMPLETE DOMINANCE

Incomplete Dominance: The heterozygous genotype produces a phenoytype that falls in between the dominant trait and the recessive trait.e.g. Four ‘O’ clock plant

Incomplete Dominance

(1822-1884)Gregor Johann Mendel

Phenotypic ratio:- 1:2:1Genotypic ratio :- 1:2:1

Fig. 13.7, Incomplete dominance in chickens

The golden palomino horse is a cross between a white and a brown horse. This is another example of incomplete dominance: the colors appear to blend in the horse’s hairs.

Phenotypic & genotypic ratio:- 1:2:1

X

Purebred brown X purebred albino :-

This is a hypomelanistic cornsnake (tannish-orange)

sperm

eggs

mother

father

C2C1

C2C1

C2C1 C2

C1

C1C1 C1C2

C1C2 C2C2

In humans, a gene affecting hair texture (curly, wavy, straight) shows incomplete dominance.