When a pure breed, red flower producing plant of genotype RR is crossed with a pure breed, white flower producing plant of genotype rr, all the F1 plants produced pink flowers. If all the plants in each generation from F1 to F6 are selfed, what will be the percentage of the plants with red and white flowers in the final population consisting of a large number of the population?
(Consider that flower color has no effect on reproduction and survival)

3-4

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12-13

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49-51

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97-100

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Solution

The correct option is C 49-51
No matter for how many generations the crosses are done, the results will always be synonymous because the pink flowers on fertilization will produce red:pink:white flowers in the ratio of 1:2:1. So the total percentage of the red and white flowers in the F6 generation, i.e, in the final population will be (2/4)*100=50%. The punnett square showing the cross between two pink flowers will elaborate on the details:-
R r
R RR Rr
r Rr rr
So the correct option is '49%-51%'.

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