X-Ray-Induced "Stickiness" of the Chromosomes of the Chortophaga Neuroblast in Relation to Dose and Mitotic Stage at Treatment

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Abstract
Observations of X-rayed hanging-drop preparations of grasshopper neuroblasts in artificial medium at short time intervals immediately after treatment demonstrate that of the mitotic stages examined, namely, very late prophase, prometaphase, metaphase, and anaphase, the earlier the stage, the greater the degree of "stickiness" produced by a given dose. This may indicate either that a positive correlation exists between the degree of "stickiness" produced and the time interval available for it to develop between treatment and detection or that the susceptibility of the chromosomes to this effect diminishes as cells progress through the mitotic stages studied.