Question

A garden pea plant bearing terminal and violet flowers when crossed with another pea plant bearing axial and violet flowers, produced axial and violet flowers and axial and white flowers in the ratio of 3:1. Work out the cross showing the genotypes of the parent pea plants and their progeny.

Answer 1

Answer:

Parents: ttpp x TtPp

Gametes: tP, tp TP, Tp, tP, tp

Terminal purple flowers ttpp

Terminal white flowers

In 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).