wap2/wap9 mutant flies are characterised by three phenotypes: 1) In ~10% of adult flies there are supernumerary crossveins located between the second and third longitudinal wing veins 2) the tergal depressor of the trochanter (TDT) (a prominent tubular jump muscle in the thorax) is missing 3) mutants show semi-lethality.
wap9 mutants initiate founder cell specification and myoblast fusion of the tergal depressor of the trochanter (TDT) jump muscle, but this is not sustained and the nascent jump muscles don't continue development.
Maternal-effect.
Lethality occurs during pupal or adult stages. Homozygous germline clones display maternal effect lethality. Embryos derived from heterozygous mothers exhibit no CNS or PNS defects.
Induced in a chromosome carrying mei-9a and mei-41D5.