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Increased B chromosome frequency and absence of drive in the fish Prochilodus lineatus
(1997-11-01)
The neotropical freshwater fish species Prochilodus lineatus (Pisces, Prochilodontidae) shows 2n = 54 chromosomes plus supernumerary microchromosomes ranging in number from zero to seven among different animals. The ...
Physical chromosome mapping of repetitive DNA sequences in Nile tilapia Oreochromis niloticus: Evidences for a differential distribution of repetitive elements in the sex chromosomes
(Pergamon-Elsevier B.V. Ltd, 2008-06-01)
Repetitive DNAs have been extensively applied as physical chromosome markers on comparative studies, identification of chromosome rearrangements and sex chromosomes, chromosome evolution analysis, and applied genetics. ...
Chromosome mapping of repetitive sequences in Anostomidae species: Implications for genomic and sex chromosome evolution
(2012-12-01)
Background: Members of the Anostomidae family provide an interesting model system for the study of the influence of repetitive elements on genome composition, mainly because they possess numerous heterochromatic segments ...
Electrophoretic characterization ofaspergillus nidulans strains with chromosomal duplications
(Genetics and Molecular Biology, 2019)
Chromosomal painting and ZW sex chromosomes differentiation in Characidium (Characiformes, Crenuchidae)
(Biomed Central Ltd., 2011-07-25)
Background: The Characidium (a Neotropical fish group) have a conserved diploid number (2n = 50), but show remarkable differences among species and populations in relation to sex chromosome systems and location of nucleolus ...
B chromosome in the beetle Coprophanaeus cyanescens (Scarabaeidae): emphasis in the organization of repetitive DNA sequences
(Biomed Central Ltd., 2012-11-06)
Background: To contribute to the knowledge of coleopteran cytogenetics, especially with respect to the genomic content of B chromosomes, we analyzed the composition and organization of repetitive DNA sequences in the ...
Cytogenetic characterization of distinct B chromosomes in a population of the fish Astyanax bockmanni (Teleostei, Characiformes)
(Univ Florence Botany Inst, 2012-01-01)
Individuals of Astyanax bockmanni from one population belonging to the Paranapanema River basin, southeastern Brazil, were cytogenetically examined. In the present paper, we report a diploid number of 50 chromosomes, with ...
Chromosomal painting and ZW sex chromosomes differentiation in Characidium (Characiformes, Crenuchidae)
(Biomed Central Ltd., 2011-07-25)
Background: The Characidium (a Neotropical fish group) have a conserved diploid number (2n = 50), but show remarkable differences among species and populations in relation to sex chromosome systems and location of nucleolus ...
Location of 45S Ribosomal Genes in Mitotic and Meiotic Chromosomes of Buthid Scorpions
(Zoological Soc Japan, 2014-09-01)
Buthid scorpions exhibit a high variability in diploid number within genera and even within species. Cytogenetically, Buthidae differs from other families of Scorpiones based on its low diploid numbers, holocentric ...