The cross was between a rough-coated guinea pig and a smooth-coated one. The allele R is dominant to r. Thus, the genotypic cross would be R_ x rr.
In guinea pigs, rough coat (R) is dominant over smooth coat (r). A rough coat-coated guinea pig is bred to a smooth one, giving 8 rough and 7 smooth progeny in the F1 generation. What are the genotypes of the parents?
a. Rr x Rr
b. RR x rr
c. rr x rr
d. Rr x rr
e. RR x Rr
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