Question

When two hybrids Ttrr and Rrtt are crossed, the phenotypic ratio of offspring shall be:
1. 3:1
2. 1:1:1:1
3. 1:1
4. 9:3:3:1

Answer 1

option 4 is the answer.

Answer 2

1.Gametes formed by Ttrr are of two types Tr and tr 2 Gametes formed by ttRr are tR and tr
3.The resultant offsprings will be ::-

1.TtRr Tall stem and round seed
2.Ttrr Tall stem and wrinkled seed
3.ttRr Dwarf stem and round seed
4.ttrr Dwarf stem and wrinkled seed..
So there will be all 4 types with Phenotypic ratio of 1:1:1:1 Hope it's clear and will help...