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The phenotypic ratio in the F2 generation of a dihybrid cross is
A9:3:3:1
B3:1
C1:2:1
D1:1:1:1
Answer & Solution
Correct answer: A. 9:3:3:1
1. A dihybrid cross follows two characters at the same time.
2. In the F2 generation the phenotypes appear in the ratio 9:3:3:1.
3. That ratio can be derived as a combination of the two separate 3:1 ratios.
4. 3:1 alone is the monohybrid F2 ratio, for a single character.
_Source: NCERT Class 12 Biology Ch4 'Principles of Inheritance and Variation'_
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