EFFECT OF X- RAYS ON THE NON-DISJUNCTION OF Х-СHROMOSOMES

Abstract

The problem investigated and discussed in the work is whether the result of the action of the ionizing radiation amounts to the observed genetic effect or, alongside of this effect, certain other changes are induced potentially capable of producing the perceptible genetic effect after the application of some other supplementary factor. In other words whether the phenomenon conventionally designated by the author as the "aftereffect" does exist or not. The genetic effect recorded in this study was the frequency of the primary non-disjunction of л-chromosomes in Drosophila. The x-ray dosage was"3000 R. The supplementary factor used was high temperature ( + 3 7 ° C). The results obtained are suggestive of the existence of the ''aftereffect'*.