In guinea pigs, the allele for rough fur, R, is dominant over the allele for smooth fur, r. What might be the possible genotype of a guinea pig with rough fur?
A
The guinea pig can have either a RR or Rr genotype.
B
The guinea pig can have either a Rr or rr genotype.
C
The guinea pig can have only a genotype of RR.
D
The guinea pig can have only a genotype of rr.