Question

A blue colour plant denoted by BB is crossbred with a white colour flower plant denoted by ww

a) state the colour of flower we could expect in their F1 progeny.

b) Write the percentage of plants bearing white flowers in F2 generation when the flowers of F1 plants were selfed.

c) state the expected ratio of the genotype BB andBw in the F2 progeny

Answer 1

(a) In the first generation i.e. in F, generation, all the flower plants will be of blue color.  As the Blue trait was dominate

(b) When flowers of f1 generation are self-pollinated:

So, in F2 generation, there will be three blue Flowers and one white flower. So they ratio of blue flower plant to ratio of white flower plant is 3:1

But we need to find the ration percentage of white flower which is 25%

c)  the expected genotype ratio is 1:2:1

This Will become more clear from the attachment