Polytene chromosomes normal.
lethal | male
visible | dominant
eye
ommatidium
Heterozygous females are nearly wild-type, but show occasional traces of the N phenotype. Nfa-l2/Nfa-g flies have rough, irregular eyes. Nfa-l2/NAx-J14 is viable, with the surviving females showing a strong abruptex phenotype as well as rough eyes.
Nspl-1
Lefevre.