Abstract
The chromosomal location of the ribosomal cistrons 18 + 26S and 5S has been determined in spermatocytes of two cytological races of Pycnogaster cucullata by in situ hybridization using molecular probes from both types of rDNA. A comparative analysis with previous results suggested the existence of more 18 + 26S rDNA sites than active NORs as shown by silver impregnation, but 5S rDNA sites are outside the NORs. Thus, different categories of latent NORs have been shown in this specialised cell type which are discussed in relation to the evolutionary process of differentiation in this species.
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Santos, J., Sentís, C., García-Rodríguez, J. et al. Latent NORs in the species Pycnogaster cucullata (Orthoptera). Heredity 65, 7–10 (1990). https://doi.org/10.1038/hdy.1990.63
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DOI: https://doi.org/10.1038/hdy.1990.63