Question

Describe the dihybrid cross with a diagram.

Hint:

Dihybrid cross ratio = 9:3:3:1 (round yellow, round green, wrinkled yellow, wrinkled green).

Answer 1

Mendel's Dihybrid Cross: Mendel's dihybrid cross involved pea plants with contrasting traits of seed shape (round/wrinkled) and seed color (yellow/green).

Steps in the Dihybrid Cross:

• Parental Generation (P): RRYY (round yellow) × rryy (wrinkled green).
• First Filial Generation (F1): All RrYy (round yellow).
• F2 Generation (Self-Cross): Produces a phenotypic ratio of 9:3:3:1 (round yellow, round green, wrinkled yellow, wrinkled green).