Homozygous Fas3E25 null females lay eggs with normal length dorsal appendages but these appendages have stalks that are wider than normal and have a larger lumen.
The muscle 6/7 cleft is innervated normally in 91% of cases in homozygous 18 hour embryos. The RP3 growth cone misinnervates muscle 13 in 7% of cases. Innervation at the muscle 6/7 cleft is missing in 53% of cases in Fas3E25 embryos carrying Fas3Mhc.PC. In 43% of cases RP3 growth cones extend normally and innervate the 6/7 cleft. In another 43% of cases, after reaching the target region, the RP3 growth cones stall beneath the 6/7 cleft, and in 14% of cases the RP3 growth cones mistarget nearby muscles. The 6/7 cleft lacks normal innervation in 26% of cases in third stage Fas3E25 larvae carrying Fas3Mhc.PC, and the membranes of muscles 6 and 7 appear tightly adhered to each other, in contrast to wild-type.
Embryonic nervous system is normal and the axon pathway and target selections of both RP3 and RP1 motor neurons are normal.
Slightly reduced grooming behavior.
Homozygotes are viable and have no gross morphological abnormalities (Elkins, Ferres-Marco and Goodman). Increased branching of wing sensory axons in discs during metamorphosis: medial axons cross to the lateral tract.
Elkins.
Null mutation resulting from the imprecise excision of a nearby P element.
Mutant embryos show no defect in midgut development.