Question

A tall true breeding garden pea plant is crossed with a dwarg true breeding m

Answer 1

tall(TT) cross with dwarf(tt)

F1 hybrid is Tt

on selfing F1 hybrid

Tt X Tt

we get:

TT, Tt, Tt, tt

the result is

there are 3 tall progeny(TT,Tt,Tt) and 1 dwarf progeny(tt)

phenotypic ratio: 3:1

genotypic ratio: 1:2:1 [1 TT(pure tall), Tt,Tt(tall)and tt(pure dwarf)]