Cytogenetics and Cell Genetics · 2008 · 60 citations · 0 references
Life SciencesBiologyGeneticsCytogeneticsFish BiologyFish GeneticsChromosome BandingChromosome BiologyChromosome MorphologyComparative CytogeneticsFish ReproductionSex Chromosome CytogeneticsChromosome Banding AnalysisChromosome Banding PatternsChromosome Banding TechniquesComparative Karyotype AnalysisMolecular Sex DifferentiationRobertsonian RearrangementsRobertsonian TranslocationsSex Determination In Fish
The karyotypes of two fish species (genus Eigenmannia) from Brazilian rivers were studied with various chromosome banding techniques. BrdU incorporation appears to be the most powerful method for identifying chromosome homoeologies between karyotypes. It also demonstrates asymmetrical heterochromatic segments, suggesting an uneven distribution of A-T base pairs in the two DNA strands. In one of these species, males differ from females by the acquisition of a Robertsonian translocation, resulting in a loss of a heterochromatic segment, which may be related to sex differentiation.