In Genetics, the Dash Symbol (-) Is a "Wild Card

Multiple Choice

In genetics, the dash symbol (-) is a "wild card" that stands for either the dominant allele or the recessive allele; for example, R- means the individual has either the genotype RR or Rr. In Duroc-Jersey pigs, genotypes R- S- have a red coat color, R- ss and rr S- have sandy-colored coats, and rr ss pigs are white. R and S show independent assortment. What cross is expected to result in all sandy-colored progeny?

A) RR SS × rr ss
B) RR Ss × Rr SS
C) Rs Ss × Rr Ss
D) RR ss × rr SS
E) rr ss × rr ss