In a dihybrid cross between two heterozygous pea plants (RrYy × RrYy), what is the phenotypic ratio of the offspring for seed shape and seed color? (R = round, r = wrinkled; Y = yellow, y = green)
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In a dihybrid cross between two heterozygous parents, the phenotypic ratio is typically 9:3:3:1 if the traits are independently assorting. Memorize this ratio for quick recall, but understand it by considering the independent segregation of each trait.