You identify an orange mutant of Drosophila. You obtain a true breeding orange-bodied line and a true breeding wildtype bodied line.

You perform a reciprocal cross and find:

Female orange x male wildtype: All progeny orange bodied

Female wildtype x male orange: All progeny orange bodied

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

Note: pay attention to the case of the letters.