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

In incomplete dominance

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In Mirabilis jalapa, when homozygous red-flowered and white-flowered plants are crossed, all $F_1$ plants have pink-coloured flowers. In $F_2$ produced by selfing of $F_1$ individuals, red, pink and white flowered plants appear respectively in the ratio of or What will be the ratio in $F_2$ generation if red-flowered variety of Mirabilis jalapa is crossed with white-flowered variety

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A plant with red flowers was crossed with another plant with yellow flowers. If $F_1$ showed all flowers orange in colour, explain the inheritance.

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$A$ : 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

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$F_2$ generation in a Mendelian cross showed that both genotypic and phenotypic ratios are same as $1 : 2 : 1$. It represents a case of

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(AIPMT-2012)

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.

Solution

Similar Questions

In incomplete dominance

A plant with red flowers was crossed with another plant with yellow flowers. If $F_1$ showed all flowers orange in colour, explain the inheritance.

$A$ : 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

$F_2$ generation in a Mendelian cross showed that both genotypic and phenotypic ratios are same as $1 : 2 : 1$. It represents a case of

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$A$ : 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