Q.2 A blue colour flower plant (BB) is cross bred with that of white colour flower plant (bb). Answer the following questions----
(i) State the colour of flower you would expect in first filial generation (F1). (ii) What must be the percentage of white flower plant in seconds filial generation (F2) if plants of F1 generation are self pollinated.
Answers
Answer:
I blue due to dominance
Answer:
(1). blue colour
(2).25%
Explanation:
(1).In the first generation all the flowers plants will be blue colour.
BB bb
| \ / \
B B b b
(a) = Bb
(b) = Bb
(c) = Bb
(d) =Bb
blue colour flower are domnent. So, all the flowers plants will be blue colour.
(2).when flowers of F1 generation are self
pollinated ,
Bb Bb
/ \ / \
B b B b
(a). BB (blue)
(b). Bb (blue)
(c). Bb (blue)
(d). bb (white)
so, in F2 generation ,there will be three blue flowers and one white flower.So, there ratio of blue Flower plant to ratio of white flower plant is 3:1.
percentage = no. of white flower plant / Total plants in F2 generation *100
= 1/4*100
= 25%