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Chromosomal location of the ribosomal RNA genes in Triturus vulgaris meridionalis (Amphibia, Urodela)
No full textThe 5S ribosomal RNA genes have been localized in mitotic and lampbrush chromosomes of Triturus vulgaris meridionalis by in situ hybridization. These genes are clustered in a single locus in an intercalary position of the long arm of chromosome XI. In lampbrush chromosome XI the 5S genes are located near a loop landmark mapped at 66 units
Chromosome location of the ribosomal RNA genes in Triturus vulgaris meridionalis (Amphibia, Urodela). II. Intraspecific variability in number and position of the chromosome loci for 18S + 28S ribosomal RNA.
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Chromosome location of the ribosomal RNA genes in Triturus vulgaris meridionalis (Amphibia, Urodela).IV. Comparison between in situ hybridization with H3 18S+28S rRNA and AS-SAT staining
No full textChromosome location of the ribosomal RNA genes in Triturus vulgaris meridionalis (Amphibia, Urodela)
No full textThe mitotic chromosomes of six specimens from Triturus vulgaris meridionalis have been examined by both in situ hybridization with 3H 18S + 28S rRNA and AS-SAT staining method. The results of these two sets of experiments can be summarized as follows: 1) in each specimen the NORs and the additional ribosomal sites, which react positively to in situ hybridization with 3H 18S + 28S rRNA, are also stained by silver; 2) other chromosomal regions, which do not hybridize in situ with 3H 18S + 28S rRNA, are on the other hand stained by the AS-SAT method. These latter AG-positive sites show a species-specific pattern of chromosomal distribution
The ribosomal DNA in Triturus vulgaris meridionalis : are the additional ribosomal genes amplified during oogenesis?
No full textComparison between AS-SAT staining and in situ hybridization in the chromosomes of Triturus vulgaris meridionalis
No full textChromosome location of the genes for 28S, 18S and 5S ribosomal RNA in Triturus marmoratus (Amphibia Urodela)
No full textChromosome location of the ribosomal genes in Triturus vulgaris meridionalis (Amphibia Urodela). III. Inheritance of the chromosomal sites for 18S + 28S ribosomal RNA.
No full textIn Triturus vulgaris meridionalis, the 18S + 28S rDNA sequences have been shown to be located in a number of additional chromosomal sites besides the nucleolus organizing region. The additional ribosomal sites have been found to vary as to their number and chromosomal location in different individuals of the species.--The data presented in this study concern the chromosomal distribution of the ribosomal sequences as analyzed by in situ hybridization technique in two individuals as well as in their offspring. The evidence obtained by this analysis indicates quite clearly that all 18S + 28S rRNA sites present in each individual genome are inherited according to simple mendelian principles
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