| Registro completo |
| Provedor de dados: |
Genet. Mol. Biol.
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| País: |
Brazil
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| Título: |
B chromosomes in a population of Astyanax eigenmanniorum (Characiformes, Characidae) from the Araguari River Basin (Uberlândia, MG, Brazil)
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| Autores: |
Torres-Mariano,Alessandra Ribeiro
Morelli,Sandra
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| Data: |
2008-01-01
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| Ano: |
2008
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| Palavras-chave: |
Characidae
Astyanax eigenmanniorum
Supernumerary chromosome
Heterochromatin
Nucleolus organizing regions (NORs)
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| 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.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200015
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| Editor: |
Sociedade Brasileira de Genética
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| Relação: |
10.1590/S1415-47572008000200015
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| Formato: |
text/html
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| Fonte: |
Genetics and Molecular Biology v.31 n.1 suppl.0 2008
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| Direitos: |
info:eu-repo/semantics/openAccess
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