When a pure bred, red flower-producing plant of genotype $R R$ is crossed with a pure bred, white flower-producing plant of genotype $r r$ , all the $F_{1}$ plants produced pink flowers. If all the plants in each generation from $F_{1}$ to $F_{6}$ are self-bred, what will be the percentage of plants with red and white flowers in the final population consisting of a large number of individuals?(Consider that flower colour 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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30 - 40

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Solution

The correct option is D $30 - 40$
It is a monohybrid cross, wherein each F $_{1}$ generation when the pink plants are self-bred, they give rise to one red plant, 2 pink plants, and 1 white plants and the white and red plants give rise to one red and white plant respectively. The breeding grows exponentially and by F $_{6}$ there is 30-40% of pure white and red plants in the massive population.

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