You identify a polka-dot mutant of Drosophila. You obtain a true breeding polka-dot line and a true breeding wildtype line (no dots)

You perform a reciprocal cross and find:

Female polka-dot x male wildtype: Females wildtype (no dots), males polka-dot

Female wildtype x male polka-dot: All progeny wildtype (no dots)

How would you express the wildtype and mutant alleles, respectively?

Pay attention to the cases of the alleles.