Question

A blue colour flower (BB) bearing plant is crossed with a plant with white coloured flowers (bb).

1. State the colour of the flowers you would expect in their F₁ progeny.
2. What must be the percentage of white flower plants in the F₂ generation, if the F₁ plants are self-pollinated?
3. State the expected ratio of genotypes BB and bb in F₂ progeny.

Answer 1

Blue colour flower plant: BB

White colour flower plant: bb

The cross involved is as follows:

1. In the F₁ generation, all plants will have blue flowers.
2. In the F₂ generation, 25% of flowers are white in color.
3. The ratio of the genotypes BB and Bb in the F₂ generation would be 1(BB) : 2(Bb).