In pea plants, round peas are dominant (R) and shriveled peas are recessive (r), and yellow peas (shown as light gray in the Punnett square) are dominant (Y) and green peas (dark gray) are recessive (y). Using this information and the partial Punnett square shown, what is the phenotypic ratio of the offspring pea plants in this Punnett square?
A) 12:1:1:4
B) 9:3:3:1
C) 3:3:1:1
D) 1:1:1:1
Answer: C
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