Otro
Occurence of karyotypical mosaicism in Trichomycterus paolence (Teleostei, Trichomycteridae)
Registro en:
Caryologia, v. 55, n. 4, p. 283-287, 2002.
0008-7114
10.1080/00087114.2002.10797877
WOS:000181065300002
2-s2.0-0042308632
Autor
Torres, Rodrigo A.
Foresti, Fausto
Oliveira, Claudio
Resumen
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.