In a Mendelian monohybrid cross,the $F_2$ generation shows identical genotypic and phenotypic ratios. What does it tell us about the nature of alleles involved? Justify your answer.

(N/A) When the $F_2$ generation of a monohybrid cross exhibits identical genotypic and phenotypic ratios,it indicates the phenomenon of incomplete dominance.
In incomplete dominance,neither of the two alleles is completely dominant over the other.
As a result,the heterozygote $(Rr)$ expresses an intermediate phenotype,distinct from both the homozygous dominant $(RR)$ and homozygous recessive $(rr)$ parents.
For example,in snapdragon plants,the cross between red-flowered $(RR)$ and white-flowered $(rr)$ plants results in pink-flowered $(Rr)$ plants in the $F_1$ generation.
Upon selfing the $F_1$ generation,the $F_2$ generation shows:
Phenotypic ratio $\rightarrow$ Red : Pink : White = $1:2:1$
Genotypic ratio $\rightarrow$ $RR : Rr : rr = 1:2:1$
Since both ratios are $1:2:1$,it confirms that the alleles show incomplete dominance.