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The Location of the nucleolus organizer regions in Drosophila hydei

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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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Hennig, W., Link, B. & Leoncini, O. The Location of the nucleolus organizer regions in Drosophila hydei . Chromosoma 51, 57–63 (1975). https://doi.org/10.1007/BF00285808

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  • Developmental Biology
  • Terminal Region
  • Organizer Region
  • Metaphase Chromosome
  • Hybridization Experiment