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