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In the classic dihybrid F2 Punnett square (Rr Yy x Rr Yy), what is the total number of possible genotype combinations shown?

Question
In the classic dihybrid F2 Punnett square (Rr Yy x Rr Yy), what is the total number of possible genotype combinations shown?
4
9
16
32
Answer
16
Detailed Explanation
A 4x4 Punnett square for a dihybrid cross (4 gamete types from each parent) yields 16 total combinations.
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