If we are required to determine the genetic combinations that could be present in a single grain of pollen produced by the plant would be equivalent to the cross between the two traits i.e
Ss x Tt
The resulting genetic combinations would be a pair of allele having one allele of each trait.
Large ecosystems always have higher biodiversity than smaller ecosystems. A large area of a forest will likely have higher biodiversity than a smaller area of a small area and small ecosystems always have low biodiversity.
There would still be a 50% chance for the offspring to be Heterozygous (Hybrid), but then there would be another 50% chance for the offspring to be Homozygous recessive (True-breeding short plants)