Weak phenotype. The number and size of proteinaceous yolk spheres in stage 10 oocytes produced by homozygous females appears normal. Oviposited eggs of homozygous females collapse with time. Oocytes produced by hemizygous yl⁹/Df(1)g females have fewer and smaller proteinaceous yolk spheres than oocytes laid by wild-type females. The mature eggs laid by these females collapse after oviposition. Homozygous and yl⁹/yl^262b stage 10 oocytes have approximately 50% of the wild-type number of coated pits and vesicles. Hemizygous stage 10 oocytes have approximately 42% of the wild-type number of coated pits and vesicles. yl⁹/yl^262b females are sterile, although their oocytes do contain yolk protein. The level of vitellogenin in the adult hemolymph of yl⁹/yl⁹, yl⁹/Df(1)g or yl⁹/yl^262b females is intermediate between that of wild-type and yl^262b homozygotes.

female-sterile