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Independent inheritance of two separate traits, shape and color of seeds in Mendel's cross on pea plants resulted in an observable ratio of?

Mendel's cross on pea plants produced an observable ratio of 9: 3: 3: 1 as a result of the independent inheritance of two distinct traits, seed shape, and color. 

There are four different types of gametes in the F1 plant: RY, Ry, rY, and ry. Each allele pair has an independent assortment of genes on distinct chromosomes. 

As a result of crossing F1, the phenotypic ratio was 9:3:3:1 (9 yellow and round seeds, 3 round and green seeds, 3 yellow and wrinkled seeds, and 1 green and wrinkled seed)

Mendel's law of segregation explains the 9:3:3:1 ratio as the result of the random distribution of alleles in offspring, as governed by the principle that each gamete receives only one allele of a gene.