Problem: If an intercross of dihybrids produces a 12:3:1 offspring phenotypic ratio, then the cross Aabb x AaBb should produce a ________ phenotypic ratio.A. 9:3:3:1B. 1:1:1C. 2:1:1D. 1:3E. 6:1:1

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This phenotypic ratio of the dihybrid cross, being a modified version of 9:3:3:1 is an indication that the two genes, despite independent assortment, follow a type of epistatic interaction.

The Punnet square for a cross between Aabb and AaBb is shown below:

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Problem Details

If an intercross of dihybrids produces a 12:3:1 offspring phenotypic ratio, then the cross Aabb x AaBb should produce a ________ phenotypic ratio.

A. 9:3:3:1

B. 1:1:1

C. 2:1:1

D. 1:3

E. 6:1:1