Question

A blue colour flower plant denoted by BB is crossbred with that of white colour flower plant denoted by bb.

(a) State the colour of flower you would expect in their $F_1$ generation plants.

(b) What must be the percentage of white flower plants in $F_2$ generation if flowers of $F_1$ plants are self-pollinated?

(c) State the expected ratio of the genotypes BB and Bb in the $F_2$ progeny.

Answer 1

Blue colour flower plant - BB

White colour flower plant - bb

The cross involved is as follows:

Blue Colour Flower $\to BB$

White Colour Flower $\to bb$

(a) In $F_1$ generation, all plants will have a blue flower.

(b) In the $F_2$ generation, 25% of flowers are white in colour.

(c) The ratio of the genotypes BB and Bb in the $F_2$ generation would be 1(BB) : 2 (Bb).