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In a DIHYBRID cross of YyRr × YyRr, the F2 phenotypic ratio is:

A$9:3:3:1$
B$3:1$
C$1:1:1:1$
D$1:2:1$
Answer & Solution
Correct answer: A. $9:3:3:1$
Mendel's Law of Independent Assortment: dihybrid F2 phenotypic ratio = 9:3:3:1. 9 dominant-both : 3 dominant-1 recessive-2 : 3 recessive-1 dominant-2 : 1 recessive-both.
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