suppose a population is carrying a condition controlled by two alleles: r (dominant) and r (recessive). if the frequency of the r allele is 15%, and the frequency of the r allele is 85%, what will be the frequency of the rr genotype, assuming evolution is not occurring?

a. 25.5 percent
b. 72.25 percent
c. 12.75 percent
d. 2.25 percent