How does Mendel's experiment show that traits are inherited independently?

Explanation

In a Dihybrid cross, where two pairs of characters with two contrasting forms each were crossed (round and green with wrinkled yellow seeds), all the `F_1` generation produced round and yellow seeds (RrYy). The `F_1` generation plant was self fertilized resulting in the formation of `F_2` generation offsprings The `F_2` offsprings are round and yellow, round and green, wrinkled yellow and wrinkled green in the ratio of 9:3:3:1. The traits were expressed independent of each other resulting in offsprings with new combination of traits (wrinkled yellow, round yellow, wrinkled green) in `F_2` generation.