Question

During dihybrid cross, the ratio of yellow : green and round : wrinkled in F₂ generation is

(A) 1 : 3

(B) 3 : 1

(C) 9 : 3

(D) 3 : 9

Answer 1

(B) 3 : 1

Yellow round = 9

Yellow wrinkled = 3

Green round = 3

Green wrinkled = 1

From above,

i. Yellow coloured seeds = 9 + 3 = 12

Green coloured seeds = 3 + 1 = 4

∴ Yellow : Green = 12:4 = 3:1

ii. Similarly,

Round seeds = 9 + 3 = 12

Wrinkled seeds = 3 + 1 = 4

∴ Round wrinkled = 12:4 = 3:1