Homozygotes have a vgnp wing phenotype. Postscutellars and halteres are wild-type. vg85b/vg83b27 transheterozygotes have wild-type wings, halteres and postscutellars.
homozygous wing phenotype like that of vgnp halteres present postscutellar bristles present homozygous viable female-fertile?
"irradiation" was stated as tentative. "spontaneous" was stated as tentative.