Mutation is leaky, some hemizygous males survive. Viability of these males is reduced at 18oC. Male adult cuticle and bristles are very pale with a yellowish cast. Pupae cases are also very pale. Recovered as suppressor of b; cold-sensitive in males and females. At 25oC, qs2/qs2 females only 1% viable but qs2/Y males as viable as wild type.