Mushroom body calyces in mbmN337 mutants are reduced to approximately 20-50% volume of wild-type flies. Gross brain morphology appears relatively normal.
mbmC1 heterozygous flies demonstrate comparable patterns of landmark orientation, indicating similar responses to visual stimulation in Buridan's paradigm as control flies.
mbmC1 heterozygous flies exhibit reduced activity levels and walk slower than control flies.
Flies have a number of brain defects, the exact phenotype depending on the genetic background. In the original genetic background in which it was induced, mbmC1 produces the following phenotype; the calyx is 1/4 normal size, the peduncle and lobes are thin or absent, the antennal lobe is reduced, the ellipsoid body is open ventrally and the noduli are often misshapen. When placed in a Canton S background, the phenotype is similar to that in the original genetic background, although the central complex defects are less penetrant.
Calyces, pedunculi and lobes, and antennal lobes are small.
Phenotype similar to that of mbm; also, the pair of antennal lobes differ in volume in most mbmC adults (i.e. left smaller than right, or vice versa); learning very poor in tests of females, using olfactory stimuli.
