Heterozygotes have supernumerary bristles on the notum (average 18.5 per heminotum compared to the wild type number of 11).
Heterozygous females have on average 18.5 bristles per heminotum (compared to the wild-type 11 per heminotum).
Heterozygotes have supernumerary macrochaetae, with an average of 19 large bristles per heminotum (wild-type number is 11 macrochaetae per heminotum). Heterozygous females have an average of 21 large bristles per heminotum and heterozygous males have an average of 17 large bristles per heminotum. Bristle number and position vary, even within the two heminota of a single animal. Extra bristles are found only on the scutum and on the scutellum. Adjacent supernumerary bristles are never seen. gcmPyx homozygotes (Tp(2;2)Pyx homozygotes in which the lethality of the ftPyx allele associated with the 24D breakpoint has been rescued by Dp(2;Y)odd4.13) are viable and have a bristle phenotype stronger than that of heterozygous adults. gcmPyx/gcmN7-4 adults have the same phenotype as gcmPyx/+ flies (extra macrochaetae on the notum). Embryos do not show defects in glial development.