Bactrocera zonata (Saunders) is a destructive polyphagous insect that infests various fruits and vegetables worldwide. Nowadays, radiation technology is widely used as a safe tool for controlling it. Therefore, this study was designed to explore the effect of gamma radiation on adult females of B. zonata. Full-grown pupae were irradiated with female sterilizing and substerilizing doses of gamma irradiation. Exposure to gamma radiation-induced alterations in DNA patterns of adult females, the appearance of some extra bands and the deficiency of others in the RAPD-PCR amplification patterns of irradiated females when compared with unirradiated females.