X/0 males are lethal (relative viability of 0.02), X/Y males are viable (relative viability of 1.00). Levels of maternal nondisjunction are high. Males are sterile. Recovery of male lethals cannot be reduced when in combination with either E(var)71 or Df(2R)M41A10.
viability XY: 1.0 viability X0: .02 XY male sterile