Question

What is the F₂ phenotypic ratio obtained from an F₁ × F₁ cross (RrYy × RrYy)?

Options

• 1:2:1

• 9:3:3:1

• 3:1

• 12:3:1

Answer 1

In a dihybrid cross F₁ × F₁ (RrYy × RrYy), the F₂ phenotypic ratio is 9:3:3:1. This is derived as a combination of 3 yellow:1 green with 3 round:1 wrinkled. The ratio represents 9 round yellow : 3 round green : 3 wrinkled yellow : 1 wrinkled green.