Answer: The plant having TtSs genotype can produce four different types of gametes, whose genotypes are- TS, Ts, tS, ts.
The plant with genotype TtSs represents two different genes that are present in the heterozygous state ( that is Tt and Ss).
As per the Mendel's law of segregation, during the process gamete formation, the variant of a gene ( also called allele) is segregated from one other so that gamete carries only one allele for the gene.
Thus, the plant with TtSs genotype produces gametes with the genotype- TS, Ts, tS, ts.