Abstract
Gibasis schiedeana from the ERPSA-Mexico, showed an autotetraploid cytotype with 2n = 16, x = 4 and had a karyotype 12M + 4A, four acrocentrics had satellites. In the cytotype from the ERPSA-Mexico, heterozygous chromosome interchange was observed, evidenced in M-I by multivalent : HI (0.91%), IV (37.90%), V (1.18%) and VI (0.82%), some of them heteromorphic. In addition, the analysis in A-I showed cells with bridge and fragment (U-type chromatid exchange) and cells with bridge without fragment (sub-chromatid aberrations, SAB) in frequencies of 4.62% and 4.10% respectively. Heterozygous chromosome interchange and chromatid exchange were also evidenced in 8 heteromorphic chromosomes. Lagging chromosomes were also recorded in A-I (7.35%). The chromatid exchange and lagging chromosomes have not been reported in other cytotypes of G. schiedeana.
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