Answer part A:
Genotype ratio:
TT (Homozygous tall plant)
Tt (Heterozygous tall plant)
Phenotype ratio:
4 tall plants
Answer part B:
If Tt and Tt plants are crossed with each other then they can produce short offspring, as shown in punnet square
Tt X Tt
F1 generation
TT, Tt, Tt, tt
Result:
It is clear from F1 generation that one offspring (tt) is short.
