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Q.
The monohybrid genotypic ratio $1 : 2 : 1$ in $F_2$ generation
indicates
Principles of Inheritance and Variation
Solution:
Law of segregation (originated by Gregor Mendel)
states that during the production of gametes the two copies
of each hereditary factor do not blend or mix up with each
other but remains together and segregate (or separate) so
that offspring obtains one factor from each parent.