, this describes a dihybrid cross. The parent plants are homozygous dominant (RRYY - Round Yellow) and homozygous recessive (rryy - Wrinkled Green). The F1 generation is entirely heterozygous (RrYy) and phenotypically Round Yellow. When F1 plants are self-pollinated, the F2 generation exhibits four phenotypes: Round Yellow, Round Green, Wrinkled Yellow, and Wrinkled Green, in the ratio of 9:3:3:1 . Options 1, 2, and 3 are incorrect because the F2 generation is not restricted to a single phenotype. Option 4, though truncated in the input, represents the mixed phenotypic outcome.