In $F_2$ generation of monohybrid cross the cause of $1 : 2 : 1$ phenotypic ratio is
Epistatics
Inhibition
Quantitative inheritance
Incomplete dominance
In poultry, new comb colour appears by colaboration of two dominant gene is
The phenotype of an individual may be affected if the modified allele produces
$(a)$ No enzyme at all
$(b)$ The normal/less efficient enzyme
$(c)$ $A$ non-functional enzyme
In case of incomplete dominance in $F_2$ generation
$A$ : In snapdragon, $F_{1}$ plants do not have red or white flowers.
$R$ : It is intermediate inheritance with neither of the two alleles of a gene being dominant over each other
Geno typic and phenotypic ration in the offspring is $1:2:1$ it explain the principle of