A blue colour flower plant denoted by BB is cross bred with that of white colour flower plant denoted by bb.
(a) State the colour of flower you would expect in their F1 generation plants.
(b) What must be the percentage of white flower plants in F2 generation if flowers of F1 plants are selfpollinated?
(c) State the expected ratio of the genotypes BB and Bb in the F2 progeny.
Answers
Answer:
Given –
Blue coloured flower plant : BB (Dominant)
White coloured flower plant : bb (Recessive)
a) BB × bb
The progenies will have the genotype as Bb.
Hence, the colour of the flower you would expect in the first generation plants is Blue.
b) In second generation, Bb × Bb.
The progeny will be BB, Bb, Bb and bb.
The percentage of white flowers in the second generation by self pollination will be 25%.
c) The expected ratio of genotypes in the second generation progeny will be 3:1.
ADDITIONAL INFORMATION –
➸ Gregor J. Mendel is said to be the father of genetics.
➸ He carried extensive research and study on genetics with the help of pea plants.
➸ He selected pea plant so that he could control and change their self pollination to cross pollination.
➸ He also chose them as they have a shorter growth period and there are a number of contrasting visible characters in the plant.
➸ The plants on which he started experiments was called the parent generation.
➸ The generation produced after crossing the parent generation plants who was called the first filial generation.
➸ When the plants in the first filial generation were crossed to produced new plants, the new plants produced was called the second filial generation.
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(a) In the first generation i.e. in F, generation, all the flower plants will be of blue color. It can be shown as follows:
(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 calculated.
So, Ratio percentage of white flower plant is 25% (c) The expected ratio of the genotypes BB and Bb in the F2 progeny.