61B;61C
66.1% viable in combination with Df(3L)17E. 99.2% of spermatids in the testes of Df(3L)17E/Df(3L)7C males are defective, being derived from one or more defective meiotic and/or mitotic divisions. Spermatids with 2 or 4 nuclei per mitochondrial derivative are often seen, and spermatids with 3, 6, 8, 12 or 16 nuclei per mitochondrial derivative are also sometimes seen.