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Question

In snapdragon, when pink flowers are crossed with white flowers then ratio of pink flowers and white flowers in the progeny is

A
10% Red
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B
Red and white in 3 : 1 ratio
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C
Pink and white in 1 : 1 ratio
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D
Pink red and white in 1 : 2 : 1 ratio
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Solution

The correct option is C Pink and white in 1 : 1 ratio
R r
r Rr (pink) rr (white)
r Rr (pink) rr (white)
Snapdragon shows incomplete dominance where both the genes express themselves equally in the heterozygous state.
The genotype of pink flowers= Rr
The genotype of white flowers= rr
In above cross Rr : rr = 2 : 2 = 1 : 1
Therefore, pink and white flowers are in equal proportions.
So, the correct option is 'Pink and white in 1 : 1 ratio'.

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