Question

Dihybrid test cross ratio proposed by Mendel is _______.

• A. 9:3:3:1
• B. 1:1:1:1
• C. 1:2:2:4:1:2:1:2:1
• D. 3:1

Answer 1

Answer: (B)

1:1:1:1

Dihybrid cross has a ratio of 9:3:3:1 but the dihybrid test cross ratio is 1:1:1:1 which indicates that the allele pairs assort independently. For example, a cross between BbEe & bbee will give a ratio of 1:1:1:1.

So, the correct answer is "1:1:1:1"