Answer;
A) 50% Rr: 50% rr
Explanation;
The cross Rr x rr, represent a cross between a heterozygous genotype and a recessive genotype.
The offspring of the cross will be; Rr, Rr, rr, rr, which means there 50 percent Rr or heterozygous and 50 percent rr, or recessive.
The formula for a heterozygous x homozygous recessive cross is;
Formula: Rr x rr
Offspring;
Geneotypes: 50% Rr, 50% rr, and
Phenotypes: 50% dominant trait, 50% recessive trait