Ts(1Lt;YSt)P7+Ts(1Rt;YLt)V24 males show defects at the individualisation process in the testes. No individualised spermatids are seen and nearly every individualisation complex (IC) is associated with a nuclear bundle. In addition, the nuclear heads appear slightly less condensed than in wild-type males. ICs are occasionally observed along the spermatid tails, away from the nuclear bundles, but none are located near the apical tip of the testes.