What result did Gregor Mendel obtain when he crossed yellow round peas with green wrinkled peas?

When Gregor Mendel crossed a variety of pea plants with yellow round seeds to a variety with green wrinkled seeds, the resulting first-generation (F1) hybrids were all yellow and round, demonstrating the dominance of the yellow and round traits.12

When these F1 plants were allowed to self-pollinate, the second-generation (F2) offspring appeared in a ratio of approximately 9:3:3:1. Specifically, the distribution was as follows:12

• 9/16 yellow round seeds
• 3/16 yellow wrinkled seeds
• 3/16 green round seeds
• 1/16 green wrinkled seeds2

From these results, Mendel deduced that the segregation of seed color is independent of the segregation of seed shape, a conclusion that led to his law of independent assortment.123