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What is the expected phenotypic ratio in the F2 generation of a classic dihybrid cross (e.g., round/yellow x wrinkled/green, tracked to F2)?

Question
What is the expected phenotypic ratio in the F2 generation of a classic dihybrid cross (e.g., round/yellow x wrinkled/green, tracked to F2)?
3:1
1:2:1
9:3:3:1
1:1:1:1
Answer
9:3:3:1
Detailed Explanation
The classic dihybrid cross F2 phenotypic ratio is 9:3:3:1 for the four possible phenotype combinations.
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