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GENETICALLY INDUCED MITOTIC EXCHANGE IN THE HETEROCHROMATIN OF DROSOPHILA MELANOGASTER
Leonard G. Robbins 1
1 Genetics Program and Department of Zoology, Colleges of Natural Science and Osteopathic Medicine, Michigan State University, East Lansing, Michigan 48824
Multiple copies of the 18S and 28S ribosomal RNA cistrons are present in both the X and Y chromosomes of Drosophila melanogaster. Data are presented here that identify a locus, Rex, that causes exchange-like events between duplicated ribosomal complexes at the ends of an attached-XY chromosome. Rex: (1) is close to or in the basal heterochromatin of the X chromosome; (2) is semidominant and (its effect) is temperature sensitive; (3) acts maternally; and (4) affects behavior of paternally derived attached-XY chromosomes shortly after fertilization. Though, at this point, the existence of Rex is known only from its effects on behavior of a particular compound chromosome, it presents intriguing possibilities for understanding regulation of chromosome behavior and organization of the ribosomal cistrons.
Submitted on April 25, 1981Revised on September 25, 1981
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