In a Mendelian monohybrid cross, F₂ generation shows identical genotypic and phenotypic rati

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4.Principles of Inheritance and Variation

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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.

Option A

Option B

Option C

Option D

Solution

In a monohybrid cross, starting with parents which homozygous dominant and homozygous recessive $F_{1}$, would be heterozygous for the trait and would express the dominant allele. But in case of incomplete dominance a monohybrid cross shows the result as follows.

Phenotypic ratio $\rightarrow$ Red : Pink: White :: $1: 2: 1$

Genotypic ratio $\rightarrow$ $RR$ : $Rr$: $rr$ : : $1: 2: 1$

Alleles can show incomplete Dominance when genotypic and phenotypic ratios are same.

Standard 12

Biology