Question

In F₂ generation, the genotypic ratio of monohybrid cross is _____ .

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

Answer 1

The Correct Option is C

To solve this problem, we need to identify the genotypic ratio obtained in the F₂ generation of a monohybrid cross.

1. Understanding Monohybrid Cross:
A monohybrid cross involves one pair of contrasting traits. The cross is between two individuals heterozygous for a single trait (Aa × Aa).

2. Genotypic Ratio of Monohybrid Cross:
The genotypes obtained in the F₂ generation are AA, Aa, and aa. The standard genotypic ratio for this type of cross is:

AA : Aa : aa = 1 : 2 : 1

3. Comparing Given Options:
(1) 9:3:3:1 – Incorrect (This is the phenotypic ratio for a dihybrid cross)
(2) 3:1 – Incorrect (This is the phenotypic ratio for a monohybrid cross)
(3) 1:2:1 – Correct (This is the genotypic ratio for a monohybrid cross)
(4) 3:1:3:9 – Incorrect (This ratio does not correspond to a monohybrid cross)

Final Answer:
The correct option is (C) 1:2:1.