You learned that the phenotypic ratio of the F2 generation of a typical test cross was 3:1. The genotypic ratio was 1:2:1. Why is a different ratio seen in a dihybrid cross? What conditions must be met for these parameters to be true?

What will be an ideal response?


Dihybrid crosses include two different traits that are tracked through the F2 generation. The expected phenotypic ratio will be 9:3:3:1. Constraints on this include: These traits must be on different chromosomes. Further, these traits cannot have more than two alleles for the traits that are tracked, they must not be codominantor incompletely dominant.

Biology & Microbiology

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