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Differences in the number of nucleolus organizers inChironomus tepperishown by in situ hybridization

✍ Scribed by Jürgen Eigenbrod

Publisher
Springer
Year
1978
Tongue
English
Weight
669 KB
Volume
67
Category
Article
ISSN
0009-5915

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✦ Synopsis

Two stocks of Chironomus tepperi could be isolated. One stock, N(IV)+, contains nucleolus organizers in chromosome I and IV, whereas the other one, N(IV)-, shows only one nucleolus in chromosome I. It is demonstrated by in situ hybridization with radioactive rRNA that the absence of the nucleolus in chromosome IV of stock N(IV)- is not related to an inactivation of the nucleolar DNA, as might have been suggested, but is due to the lack of ribosomal cistrons.

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