RADIATION-INDUCED EXCHANGES IN DROSOPHILA FEMALES

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Abstract
In attached-X females lacking a Y chromosome, most of the induced detachments involve exchanges with chromosome 4. The presence of a Y chromosome increases the frequency of induced detachment, 80 per cent or more of the cases resulting from exchanges between X and Y. With only Ys present, there is a much greater increase in detachment frequency. It is suggested that the long arm of the Y "protects" the short arm against induced exchanges with the X and possibly vice versa. With sc8.Y, sc.YL, or scvl .Ys, there is a marked reduction in the frequency of exchanges between attachedX''s and chromosome 4. This reduction is not obtained with YLC, possibly due to its shape or to its lack of the proximal part of Ys.