Any letters can be used, but typically "T" is used for tall and "t" is for short. Letters are usually chosen by using the first letter of the characteristic being described, and the upper case represents the trait being dominant. Lower case represents the trait being recessive.
TT for the homozygous tall parent, tt for the homozygous short parent and Tt for the heterozygous offspring.
True breeding tall plants would be TT and true breeding short plants would be tt, so TT x tt would illustrate the crossbreeding.
True breeding tall plants would be TT and true breeding short plants would be tt, so TT x tt would illustrate the crossbreeding.
True breeding tall plants would be TT and true breeding short plants would be tt, so TT x tt would illustrate the crossbreeding.
True breeding tall plants would be TT and true breeding short plants would be tt, so TT x tt would illustrate the crossbreeding.
TT x tt
The Punnett square would show that all offspring would be heterozygous for the trait, meaning they would have one allele for tall plants and one allele for short plants. This would result in all offspring being tall plants phenotypically, but carrying the allele for short plants.
they were all hybrids
There were three times as many tall plants as short plants.
Three times as many shorts plants as tall plants.
F1 generation
P1 or parental