Fruit flies may have either red eyes or white eyes. This is a sex-linked characteristic, and the gene controlling eye colour is found on the X chromosome. The allele for red eyes ($R$) is dominant over the allele for white eyes ($r$). A fruit fly with genotype $X^R X^r$ was crossed with a fruit fly with genotype $X^R Y$. What percentage of the offspring will have red eyes?
- A$25\%$
- B$50\%$
- C$75\%$
- D$100\%$