GENETIC ANALYSIS OF MODIFYING SYSTEM OF SEGREGATION DISTORTION IN DROSOPHILA MELANOGASTER

I. ACTIVE STAGE OF THE SD-SUPPSESSOR AND THE RECONFIRMATION OF THE DYSFUNCTIONAL SPERM MODEL

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The study of the temperature treatment revealed that the sensitive stage of SD was at early meiosis 1. This was in agreement with Mange (1968). While the sensitive stage of SD-suppressor was at early spermatid. And also it was found that St(SD) made the SD action less sensitive to the temperature treatment.
On the results of the progeny counts, the mechanism for Segregation-Distortion was examined. It was concluded that the “dysfunctional sperm” hypothesis was reasonable.