THE GENETIC AND CYTOLOGICAL ORGANIZATION OF THE Y CHROMOSOME OF DROSOPHILA MELANOGASTER

James A. Kennison ¹

¹ Department of Biology, University of California, San Diego, La Jolla, California 92093

Cytological and genetic analyses of 121 translocations between the Y chromosome and the centric heterochromatin of the X chromosome have been used to define and localize six regions on the Y chromosome of Drosophila melanogaster necessary for male fertility. These regions are associated with nonfluorescent blocks of the Y chromosome, as revealed using Hoechst 33258 or quinacrine staining. Each region appears to contain but one functional unit, as defined by failure of complementation among translocations with breakpoints within the same block. The distribution of translocation breakpoints examined appears to be nonrandom, in that breaks occur preferentially in the nonfluorescent blocks and not in the large fluorescent blocks.

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