The Effect of a Supernumerary X Chromosome on Members of the Bar Series of Drosophila

Abstract

This investigation was carried out at the Biological Laboratory of WESTERN RESERVE UN-VERSITY. The author wishes to acknowledge his indebtedness to DR. A. H. HERSH for suggesting the problem, as well as for his interest and unstinting co-operation throughout the course of the work. He also wishes to thank DR. C. R. PLUNKETT for many helpful suggestions in the hterpretation of the data.

Physiological genetics

“…But one more recent investigation is to be mentioned because it will possibly reduce the Bar case to the same type of processes that we described for vestigial. In a paper dealing with the action of the t>o-gene upon the expression of the Bar series, Margolis (1935a) finds evidence that actually the effect of the 5-gene may have nothing to do with the process of formation of ommatidia but is concerned rather with the production of something that destroys the material for ommatidia (see also Wolsky, This would be the case if a facet-destroying action of Bar were prolonged by lengthening the time of its action. All the data presented above would be interpreted in terms of a system of reactions in time, which Margolis develops tentatively along lines similar to those developed by Goldschmidt in his analytical work.…”

Studies on the Bar Series of Drosophila Iv. The Temperature-Effective Period for Facet Determination in the Wild Type

“…The large size of the-wild-type eye precludes the counting of facets directly as is done with the members of the Bar series. The method we have adopted represents a modification of a method used previously in counting eyes of large size (MARGOLIS 1934).…”