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The Location of the nucleolus organizer regions inDrosophila hydei

✍ Scribed by Wolfgang Hennig; Brigitte Link; Orilio Leoncini

Publisher
Springer
Year
1975
Tongue
English
Weight
1016 KB
Volume
51
Category
Article
ISSN
0009-5915

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✦ Synopsis

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 postion 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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