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The F2 phenotypic ratio from a standard dihybrid cross is:
A9:9:3:1
B1:3:3:9
C9:3:3:1
D3:3:3:1
Answer & Solution
Correct answer: C. 9:3:3:1
1. Each characteristic alone gives a 3 to 1 ratio.
2. Combining two independent 3 to 1 ratios expands them.
3. The combined ratio is 9:3:3:1.
_Source: OpenStax Biology 2e, Chapter 12, Mendel's Experiments and Heredity._
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