Abstract
Analyses of the distribution of rDNA genes (both 5S and 18S) using classical techniques, such as silver and CMA3 staining and FISH were carried out in specimens of Astyanax scabripinnis from Tatupeba stream (Ivaí river basin). The three cytotypes identified for this population presented multiple NOR system, with intra-populational numerical and positional variations, detected for Ag-NOR, CMA3 and 18S-FISH. In contrast, data obtained from rDNA-5S revealed a highly conserved chromosomal distribution pattern in each cytotype. Aspects on divergences among distribution pattern of sites 5S and 18S rDNA are discussed.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have