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  4. The number of different genotypes observed in the F2-generation o f a dihybrid cross are

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Q. The number of different genotypes observed in the $F_2$-generation o f a dihybrid cross are

Principles of Inheritance and Variation

Solution:

The genotypic ratio of a dihybrid cross is
$1:2:2:4:1:2:1 :2: 1$
Thus, we see that $9$ different genotypes are observed in the $F_2$-generation.