Question

Out of a population of 400 F2 individuals of a cross between Violet flowers at axial position and white flowers at terminal position in Pea plants, the number of Violet flowers at terminal position would be (a) 95 (b) 75 (c) 225 (d) 400​

Answer 1

Answer:

parents:     ttpp     x      TtPp

Gametes: tP, tp      

   

 the pea plants, violet flowers are dominant over white flowers and axial position of flowers is dominant over terminal position. It is given that, a garden pea plant bearing terminal, violet flowers is crossed with another pea plant bearing axial, violet flowers. This produced axial, violet flowers and axial, white flowers in the ratio of 3:1.

Since, both axial, violet and axial, white flowers are produced, then the genotype of the parents can only be ttPp (terminal, violet flowers) and TtPp (axial, violet flowers).

(b) The above cross is governed by the law of independent assortment. According to this law, when two pairs of traits are combined in a hybrid, one pair of character segregates independent of the other pair of character"