Nucleolus organizer chromosomes in a teleostean species of tetraploid origin, Cyprinus carpio
- 1 January 1986
- journal article
- research article
- Published by S. Karger AG in Cytogenetic and Genome Research
- Vol. 42 (4) , 183-186
- https://doi.org/10.1159/000132275
Abstract
The presence of nucleolus organizer regions (NORs) was investigated in a teleostean species of tetraploid origin, Cyprinus carpio, by means of Ag-staining. Even if four NOR-bearing chromosomes exist, only two of them are normally active. This evidence supports the hypothesis that, in this species, diploidization of gene expression may be due to a reduction in the rate of rRNA transcription.Keywords
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