If a dihybrid cross is begun with a P₁ generation of a plant that produces smooth and yellow peas, crossed with a plant that produces wrinkled green peas, the F₂ plants will have either smooth yellow peas or wrinkled green peas.

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In a dihybrid cross, the F₂ generation will exhibit a 9:3:3:1 phenotypic ratio, resulting in four different combinations: smooth yellow, smooth green, wrinkled yellow, and wrinkled green peas.

If a Dihybrid Cross Is Begun with a P₁ Generation