In dihybrid cross, why doesn't the phenotypic ratio be 3:1 like monohybrid cross. Why is it 9:3:3:1 or (3:1)²?

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Solution

Mono : Ff * Ff FF Ff Ff ff
Which is 3:1
For di if you do the same permutation combination FfTt FfTt
You will get 3:1 square

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