Phenogenetic Studies on Scute-1 of Drosophila Melanogaster. I. The Associations Between the Bristles and the Effects of Genetic Modifiers and Temperature

Phenogenetic Studies in Scute of D. Melanogaster Iii. The Effect of Temperature on Scute

“…2). Furthermore, as pointed out previously (CHILD 1935) this variation in the M. i.v. is contrary to the subgene hypothesis (DUBININ 1929, GAISSINOVITSCH 1930)~ since the i.v.…”

“…The details of selection of the sc I stock and the tests for the adequacy of selection were presented in a previous communication (CHILD 1935). The sc 5 flies were made isogenic with the sc I by twenty generations of backcrossing sc I/SC 5 by SG I males.…”

The Pattern of Supernumerary Macrochaetae in Certain Drosophila Mutants

“…However, MULLER (1932), from data accumulated in the Austin laboratory on gynandromorphs involving various scute alleles, has concluded that "the development of the bristles, insofar as it is under the influence of the scute gene, is not governed by one or a few centers, but is in its major features autonomous at the site of each bristle" (p. 250). CHILD (1935) found in scute flies a complete absence of association between the bristles of the same side, as measured by the association coefficient. He therefore concluded that the concept of a pattern in scute was based upon nothing more than a difference in mean numbers, in a group of flies, of different bristles, and did not correspond to any coordinating developmental process in the individual fly (such as a diffusion phenomenon).…”

“…These are: I ) what is the exact position of extra bristles, and 2 ) what is their size? CHILD 1935, IVES 1939).…”

Influence of Genetic Environment on the Reduction of Bristles by the Dichaete Gene in Drosophila Melanogaster

“…Another method is to prolong larval life by means of low temperatures, genes or starvation (Green and Oliver, 1940;Green, 1946;Dunn and Coyne, 1935). High temperatures, which shorten larval life, cause a decrease in the number of bristles in the mutant Dichaete (Plunkett, 1926), and alter the phenotype in other Drosophila mutants (Stanley, 1931;Child, 1935;Harnly, 1936). Neel (1941) and Sparrow and Reed (1940) reported on the interaction of mutants that affect the chaetae of D. melanogastcr.…”