True-breeding yellow guinea pigs crossed with true-breeding white ones produce only cream-colored offspring. This pattern indicates incomplete dominance. Rough hair is found to be dominant to smooth hair. Select the F1 genotypic and phenotypic ratios of a cross between a smooth, white guinea pig with a homozygous, rough, yellow guinea pig from the following choices.
A. rough cream Yy Rr
B. yellow rough YY R__
C. cream rough Yy R__
D. white rough yy R__
E. cream smooth Yy rr
Answer: A
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