Imprecise excision of the progenitor insertion. The 5' and 3' inverted terminal repeats of the insertion are still present, but the w[+] marker has been inactivated.
female sterile (with Df(3L)GN50)
female sterile | recessive
male sterile (with Df(3L)GN50)
male sterile | recessive
viable
viable (with Df(3L)GN50)