A watermelon plant with recessive 's' (for seedless) is crossed with another plant with dominant trait 'S' (for seeded). There were 243 seeded and 81 seedless plants in F2

1) What is the genotype and phenotype of the parents for the trait
2) What is the genotype and phenotype of the F1 plant
3) What is the expected genotypic and phenotypic ratio of F2 population?