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Question

Which cross yields red, white and pink flowers variety of dog flower?

A
RR × Rr
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B
Rr × RR
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C
Rr × Rr
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D
Rr × rr
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Solution

The correct option is B Rr × Rr
The F1-hybrid plants have a different phenotype (pink flowers) than either of the true-breeding parents. This is an example of incomplete dominance. When the F1-hybrid plants are self-fertilized, both parental phenotypes (red flowered plants and white flowered plants) reappear in the F2 generation.
F1 parents - RR (red) x rr ( white )
F1 individual Rr ( pink )
selfing of F1 Rr x Rr
result i.e., F2 1 ( red ): 2 (pink ): 1 (white)
Thus, the correct answer is option C.

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