NATURAL TRIPLOIDY IN ASTYANAX-SCABRIPINNIS (PISCES, CHARACIDAE) AND SIMULTANEOUS OCCURRENCE OF MACRO B-CHROMOSOMES
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Data
1994-07-01
Autores
Maistro, E. L.
Dias, A. L.
Foresti, F.
Oliveira, C.
Moreira, O.
Título da Revista
ISSN da Revista
Título de Volume
Editor
Univ Florence Botany Inst
Resumo
The occurrence of natural triploidy in two specimens of Astyanax scabripinnis collected in the Araqua river and in the Corrego das Pedras stream, respectively, is noticed. The triploid specimen from the Araqua river presented one macro B-chromosome and the triploid specimen from Corrego das Pedras stream presented two macro B-chromosomes. The C-banding performed in the specimen from the Araqua river confirmed the triploidy and showed that the macro B-chromosome was entirely heterochromatic. Ag-NOR characterization showed two chromosomes involved in the nucleolar activity in both specimens. Some aspects related to the origin of triploid fishes are described.
Descrição
Palavras-chave
FISH CYTOGENETICS, ASTYANAX-SCABRIPINNIS, NATURAL TRIPLOIDY, B-CHROMOSOMES, C-BANDING
Como citar
Caryologia. Florence: Univ Florence Botany Inst, v. 47, n. 3-4, p. 233-239, 1994.