What experiment did mendel perform to test his idea of if the color of the seed of a pea plant affected the pea shape?

Mendel performed a series of experiments by cross-pollinating pea plants with different traits, specifically focusing on seed color (yellow vs. green) and seed shape (round vs. wrinkled). He first created pure-breeding lines for each trait and then conducted dihybrid crosses to observe the inheritance patterns in the offspring. By analyzing the resulting phenotypic ratiOS, he concluded that the traits for seed color and seed shape were inherited independently, supporting his principle of independent assortment.