h24;h3

X/Ab(Y)Y2/Dp(1;Y)y⁺ males are sterile. Testes show a departure from normal development at early postmeiotic stages of spermatid differentiation. Before nuclear elongation, round spermatid nuclei begin to fall apart in a large number of spermatid bundles, resulting in singular nuclei heads that are dispersed throughout the tails. In approximately 10% of males, the testes contain exclusively round spermatids scattered throughout the length of the tails. Many of the spermatid bundles with scattered nuclei are much smaller in diameter than normal, suggesting that some of the spermatid tails fail to develop. However, some spermatid bundles show aligned nuclear heads associated with individualisation complexes, as in wild type. C(1;YS)1/Ab(Y)Y2 males are fertile. Ab(Y)Y2 is complemented by Ts(1Rt;YSt)V8. Ts(1Lt;YSt)P7/Ab(Y)Y2, Ts(1Lt;YSt)W27/Ab(Y)Y2 and Ts(1Lt;YSt)V24/Ab(Y)Y2 males produce large numbers of progeny.