X/0 males are lethal (relative viability of 0), X/Y males have reduced viability (relative viability of 0.15). Levels of maternal nondisjunction are high. Males are sterile. Recovery of male lethals is reduced when in combination with Df(2R)M41A10 : the Y-suppressed lethality is a variegated position effect.
viability XY: .15 viability X0: lethal XY male fertility: sterile failure of sperm head elongation Enhanced by Df(2R)M41A10 not enhanced by Evar7