lethal | female | recessive
visible | dominant
third segment of antenna
Males and heterozygous females show variable expression from small additional segment on the third antennal segment to a nearly complete leg including femur, tibia and tarsus. Arista usually present.
X0 males viable. Crosses involving either AntpApx males or females produce many inviable embryos.
X0 males viable. Crosses involving either AntpApx males or females produce many inviable embryos.