Lindsley & Grell, 1972, pp. 169-170
phenotype: Wings of heterozygote incised at tips and often along edges. Veins L3 and L5 thickened. Thoracic hairs irregularly distributed. Male and homozygous female lethal. Heterozygotes for any two N alleles lethal. fa/N, sp1/N, and nd/N heterozygotes express both the N phenotype and the phenotype of the recessive. N/fano is lethal. For developmental studies of N male embryo, see Poulson, 1939, DIS 12: 64-65; 1940, J. Exptl. Zool. 83: 271-325; Poulson and Boell, 1946, Anat. Record 96: 508; Counce, 1961, Ann. Rev. Entomol. 6: 295-312. RK1.
cytology: Heterozygosity for a deficiency including salivary chromosome band 3C7 produces the N phenotype (Demerec, Kaufmann, Fano, Sutton, and Sansome, 1942, Carnegie Inst. Wash. Year Book 41: 191). Many but not all N alleles are associated with chromosome rearrangements.
other information: The N alleles and the recessives fa, fano, sp1, and nd belong to a pseudoallelic complex (Welshons and Von Halle, 1962, Genetics 47: 743-59).
color figure: P. A. Otto (original)
b & W figure: Morgan, Bridges and Sturtevant, 1925, The Genetics of Drosophila, Bibliog. Genet. 2: 1-262 (original drawn by Edith M. Wallace)
photograph: P. A. Otto (original)