Lindsley & Grell, 1972, pp. 43-44
discoverer: Bridges, 15i22.
references: Bridges and Morgan, 1923, Carnegie Inst. Wash. Publ. No. 327: 137, 152 (fig.). Morgan, Bridges, and Sturtevant, 1925, Bibliog. Genet. 2: 79, 214 (fig.). Lewis, 1951, Cold Spring Harbor Symp. Quant. Biol. 16: 159-74 (fig.). 1963, Am. Zoologist 3: 33-56 (fig.).
phenotype: Anterior half of metathorax becomes mesothoracic and posterior half remains unchanged. This results in the appearance, between the scutellum and the first abdominal segment, of rudimentary anterior mesothoracic elements (i.e., mesonotum and scutellum), with the proper bristles and hairs. Balancers directed ventrally, enlarged, vesiculate or winglike, with typical but rudimentary wing venation and bristles. Metathoracic tibia has a mesothoracic tibial bristle. Variable, overlapping wild type at 25o and more so at 19oC. Dorsal metathoracic disk of mature larva is 60 percent larger than wild type [Chen, 1929, J. Morphol. 47: 135-99 (fig.)]. Thoracic musculature studied by El Shatoury [1956, J. Embryol. Exptl. Morphol. 4: 228-39 (fig.)] and Pantelouris and Waddington [1955, Arch. Entwicklungsmech. Organ. 147: 539-46 (fig.)]. Bristle patterns studied by Waddington (1962, New Patterns in Genetics and Development. Columbia University Press). Slight expression in combination with bw34e and bwW (Hollander, 1937, DIS 8: 77), and no interaction as trans heterozygote with bxd or Ubx (E.B. Lewis). RK3.
cytology: Located close to if not within the 89E1-2 doublet (Lewis, 1951).
other information: The leftmost member of a pseudoallelic series including from left to right, bx, Cbx, Ubx, bxd, and pbx.
color figure: P. A. Otto (original)
b & w figure: Bridges and Morgan, 1923, Carnegie Inst. Wash. Publ. No. 327: 152; Morgan, Bridges and Sturtevant, 1925, The Genetics of Drosophila, Bibliog. Genet. 2: 1-262 (originals drawn by Edith M. Wallace)