Ribosomal RNA genes are interspersed throughout a heterochromatic chromosome arm in Atlantic salmon
- 1 January 1993
- journal article
- animal cytogenetics-anad-comparative-mapping
- Published by S. Karger AG in Cytogenetic and Genome Research
- Vol. 63 (2) , 128-130
- https://doi.org/10.1159/000133517
Abstract
The ribosomal RNA genes (rDNA) have been mapped by fluorescent in situ hybridization (FISH) using four rDNA probes (rDNA/FISH) to Atlantic salmon chromosomes. Signals appeared over the whole heterochromatic chromosome arm displaying the secondary constriction and satellites. The size polymorphism of this short arm, revealed by C-banding, was confirmed by rDNA/FISH, supporting large interindividual differences in the number of rDNA copies. Conventional techniques for the detection of nucleolar organizer regions are discussed, and their results are compared with those of rDNA/FISH.Keywords
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