In Mirabilis, a hybrid for red (RR) and white (rr) flower produces pink (Rr) flower. A plant with pi

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4.Principles of Inheritance and Variation

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In Mirabilis, a hybrid for red $(RR)$ and white $(rr)$ flower produces pink $(Rr)$ flower. A plant with pink flower is crossed with white flower, the expected phenotypic ratio is

A

Red : pink: white $(1: 2: 1)$

B

Pink : white $(1: 1)$

C

Red : pink $(1:1)$

D

Red : white $(3: 1)$

Solution

Mirabilis jalapa shows incomplete dominance.

The ratio pink and white flowers will be $1: 1$.

Standard 12

Biology

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Reason : Flower colour gene shows incomplete dominance.

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$R$ : It is intermediate inheritance with neither of the two alleles of a gene being dominant over each other

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