Dihybrid Cross Phenotypic Ratio

In a genetic study, researchers investigated a dihybrid cross involving two traits: seed shape (round vs. wrinkled) and seed color (yellow vs. green) in pea plants. The round shape (R) is dominant over wrinkled shape (r), while the yellow color (Y) is dominant over green color (y). In the F1 generation, all plants exhibit the round yellow phenotype. When two F1 plants are crossed, what is the expected phenotypic ratio in the F2 generation for the offspring resulting from this dihybrid cross?