97% of eggs derived from cpb^F19/cpb^6.15 females show a "dumpless" phenotype. Most of the eggs are shorter than wild type.

Early stage cpb^F19/cpb^6.15 egg chambers are largely or completely normal. Defects are first seen at stage 8, with 17% of egg chambers having multinucleate nurse cells. This defect becomes more frequent as development of the egg chamber progresses; 57% of stage 9 egg chambers show this phenotype. By stage 10 and later, 66% of egg chambers have multinucleate nurse cells and many late stage egg chambers show little or no transfer of cytoplasm to the oocyte. Mutant nurse cells often bulge into the oocyte and sometimes the nurse cell-oocyte interface ruptures or nurse cell nuclei are seen in the oocyte.

Cortical actin appears relatively normal prior to dumping in cpb^F19/cpb^6.15 nurse cells that do not have defects in cortical integrity. The morphology and organisation of cytoplasmic actin filaments is substantially different from wild type; as filaments form, the oocyte and nurse cell cortex in the mutants appear "furry" , with excess actin accumulating both cortically and in the form of short filaments. As filament growth proceeds, the distribution of longer cytoplasmic filaments in the mutants is less uniform around the cortex and the filaments are more disorganised than in wild type. The nurse cell nuclei are often positioned against the cortex or protrude through and thus block ring canals.

Most cpb^F19/cpb^6.15 animals eclose significantly later than wild-type siblings, or not at all: only 20% of expected progeny numbers have emerged by 13 days after mating, and only 43% by 17 days after mating. The resulting adults have a moderate bristle phenotype charactersied by bending, branching, or splitting of some of the macrochaetae. In addition, the surfaces of these bristles have severely disrupted longitudinal grooves. The sternopleural bristles are on average approximately 30% shorter in cpb^F19/cpb^6.15 adults than in wild-type. In cpb^F19/cpb^6.15 pupal bristles (trichogen cells), the actin bundles are disorganized and displaced from the plasma membrane.

Hemizygous larvae are sluggish and die before the first moult. cpb^6.15/cpb^F19 transheterozygous adults have reduced viability but are morphologically normal and appear to walk, jump and fly normally. Males are fertile but females lay small eggs, characteristic of the 'dumpless' phenotype. All macrochaetae on the head and thorax are shorter and blunter than wild type and have a rough contour, defect is due to aberrant actin organisation. Some macrochaetae exhibit a more severe phenotype having bends or are split or a combination of both.

cpb^F19/cpb^6.15 has abnormal developmental rate phenotype, suppressible | partially by chic[+]/chic²²¹

cpb^F19/cpb^6.15 has abnormal developmental rate phenotype, suppressible | partially by chic[+]/chic³⁷

cpb^F19/cpb^6.15 has partially lethal - majority die phenotype, suppressible | partially by chic[+]/chic²²¹

cpb^F19/cpb^6.15 has partially lethal - majority die phenotype, suppressible | partially by chic[+]/chic³⁷

cpb^F19/cpb^6.15 has macrochaeta phenotype, suppressible | partially by chic[+]/chic²²¹

cpb^F19/cpb^6.15 has macrochaeta phenotype, suppressible | partially by chic[+]/chic³⁷

cpb^F19/cpb^6.15 has sternopleural bristle phenotype, suppressible by chic[+]/chic³⁷

cpb^F19/cpb^6.15 has trichogen cell & actin filament & pupa phenotype, suppressible | partially by chic[+]/chic²²¹

cpb^F19/cpb^6.15 has trichogen cell & actin filament & pupa phenotype, suppressible | partially by chic[+]/chic³⁷

cpb^F19/cpb[+] is an enhancer of ommatidium phenotype of Scer\GAL4^GMR.PF, cindr^{RNAi.PC.PD.UAS}

cpb^F19/cpb[+] is an enhancer of pigment cell phenotype of Scer\GAL4^GMR.PF, cindr^{RNAi.PC.PD.UAS}

cpb^F19/cpb[+] is an enhancer of cone cell phenotype of Scer\GAL4^GMR.PF, cindr^{RNAi.PC.PD.UAS}