Data/hora: 02/06/2024 05:45:56

Provedor de dados: 	74	
País: 	Brazil	
Título: 	B chromosomes in a population of Astyanax eigenmanniorum (Characiformes, Characidae) from the Araguari River Basin (Uberlândia, MG, Brazil)	
Autores: 	Torres-Mariano,Alessandra Ribeiro; Morelli,Sandra.	
Data: 	2008-01-01	
Ano: 	2008	
Palavras-chave: 	Characidae; Astyanax eigenmanniorum; Supernumerary chromosome; Heterochromatin; Nucleolus organizing regions (NORs).	
Resumo: 	A cytogenetic study was conducted on an Astyanax eigenmanniorum population from the Caetano Stream (18° 44' 56" S/ 048° 18' 39" W) - in Uberlândia, MG, Brazil - showing a modal diploid number of 48 chromosomes in the standard male and female karyotypes. However, in several specimens it was also possible to observe metaphases with one or two B chromosomes, increasing the diploid number to 49 or 50 chromosomes, respectively. The supernumerary chromosomes were totally heterochromatic and highlighted after C-banding. The silver-stained nucleolus organizing regions (Ag-NORs) were located in at least five chromosomes of the standard karyotype, thus characterizing a multiple NOR system in the species. This is the first occurrence of an A. eigenmanniorum population with 2n = 48 chromosomes, bearing supernumerary chromosomes.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200015	
Editor: 	Sociedade Brasileira de Genética	
Relação: 	10.1590/S1415-47572008000200015	
Formato: 	text/html	
Fonte: 	Genetics and Molecular Biology  v.31 n.1 suppl.0 2008	
Fonte: 	info:eu-repo/semantics/openAccess