Publicação: Occurence of karyotypical mosaicism in Trichomycterus paolence (Teleostei, Trichomycteridae)
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A chromosomal mosaic has at least two cell lineages with different karyotypes derived from a single zygote and the karyotype alteration can be numeric or structural as well. In the present paper were detected a numeric chromosomal alterations in a single specimen of Thichomycterus paolence from the Quinta stream (Itatinga, state of São Paulo, Brazil). In a total of 61 analysed metaphases, besides the normal chromosome number of this species (2n=54), other four chromosomal sets characterized by 2n=55 (54 plus a microchromosome), 2n=55 (54 plus a small subtelocentric chromosome), 2n=56 (54 plus a subtelocentric and a microchromosome) and 2n=57 (54 plus a subtelocentric pair and a microchromosome) have been detected. The mechanisms that have originated those abnormal karyotypical constitutions is discussed.
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Fish mosaicism, Neotropical fishes, Trichomycterus
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Inglês
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Caryologia, v. 55, n. 4, p. 283-287, 2002.
