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Q.
In a dihybrid cross, if you get $9:3:3:1$ ratio it denotes that
Principles of Inheritance and Variation
Solution:
Cross involving two contrasting characters is called dihybrid cross or a two factor cross. The two factors of each trait assort at random and independent of the factors of other traits at the time of meiosis (gametogenesis) and get randomly as well as independently rearranged in the offspring producing both parental and new combinations of traits. This explained the law of independent assortment given by Mendel.