The Location of the nucleolus organizer regions in Drosophila hydei |
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Authors: | Wolfgang Hennig Brigitte Link Orilio Leoncini |
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Institution: | (1) Friedrich-Miescher-Laboratorium der Max-Planck-Gesellschaft, 74 Tübingen;(2) Max-Planck-Institut für Biologie, Abteilung Beermann, 74 Tübingen, Federal Republic of Germany |
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Abstract: | The positions of the nucleolus organizer regions in metaphase chromosomes of Drosophila hydei were detected by in situ hybridization experiments. In agreement with earlier conclusions the nucleolus of the X chromosome was found to originate in a terminal region of the heterochromatic arm. The Y chromosome contains two nucleolus organizers, one in a terminal position of the long arm, and the other in the short arm. The implications with respect to the evolution of the Y chromosome are discussed. |
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