When a pure bred, red flower producing plant of genotype RR is crossed with a pure bred, white flower producing plant of genotype rr, all the plants produced pink flowers. If all the plants in each generation from F1 to F6 are selfed, 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 as no effect on reproduction and survival.)

Question

When a pure bred, red flower producing plant of genotype RR is crossed with a pure bred, white flower producing plant of genotype rr, all the plants produced pink flowers. If all the plants in each generation from F1 to F6 are selfed, 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 as no effect on reproduction and survival.) (A) 3-4 (B) 12-13 (C) 49-51 (D) 97-100

Tardigrade Admin · Accepted Answer

A cross between red flower producing plant and white flower producing plant is shown below

When F1 to F6 individuals during each generation are sefed, i.e.

This shows that 50 % plants are homozygous with red and white flowers. We know that homozygous plants will produce homozygous off springs. Thus during each generation the heterozygous progeny will give further 50 % heterozygous and 50 % homozygous progeny. This will reduce the number of heterozygous successively. ∴ The final population will have 97-100 % of homozygous progenies, i.e. red and white flowers plants.