Question

What is incomplete dominance? Give an example.

Answer 1

Hint: Incomplete dominance comes under the genetics. Incomplete dominance does not follow the Mendel’s dominance law. We will explain incomplete dominance in detail below.

Complete Answer:
Incomplete dominance:
->Incomplete dominance is also called partial dominance or semi-dominance.
->In incomplete dominance, both the alleles in heterozygous condition partially express themselves.
->Here the dominant allele can not completely mask the effect of recessive alleles.
->The physical appearance of the organism shows the blending of both the two alleles i.e. dominant allele as well as recessive allele.
Example of incomplete dominance:
->Cross pollination between red snapdragon and white snapdragon result in pink snapdragon.
 ->Here, neither the white allele or red allele is dominant.
->The pink colour results from the blending of both the two alleles that are white allele or white and red allele.
->RR represents the dominant red allele and rr represents the recessive allele.
->In F1 ( filial 1 ) generation, all the offspring will be of pink colour having genotype Rr.
->And in F2 generation when two heterozygotes are crossed and results in 1 red coloured snapdragon, 2 pink coloured snapdragon and 1 white coloured snapdragon in the ratio 1:2:1.

Note: Incomplete dominance does not follow the Mendel’s dominance law which states that the dominant character will completely mask the effect of the recessive character.