Using two heterozygous tall pea plants, so Tt is the genotype.
T t <---- alleles from parent one
T TT Tt
t Tt tt
^alleles from parent two on the left
Results: TT, Tt, Tt, and tt
Genotype ratio: 1/4 TT, 1/2 Tt, 1/4 tt
Phenotype ratio: T is dominant over t, so 3/4 tall and 1/4 short pea plants