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Chromosomal mapping of rDNAs and H3 histone sequences in the grasshopper rhammatocerus brasiliensis (acrididae, gomphocerinae): extensive chromosomal dispersion and co-localization of 5S rDNA/H3
A linked organization for the 5S rRNA and H3 histone multigene families investigated in R. brasiliensis is indicated, reinforcing previous data concerning the association of both genes in some insect groups and contributing to understanding the organization/evolution of multigenes families in the insect genomes. Expand
Comparative cytogenetic analysis of two grasshopper species of the tribe Abracrini (Ommatolampinae, Acrididae)
The grasshopper species Orthoscapheus rufipes and Eujivarus fusiformis were analyzed and variability in chromosomal markers accounted for the karyotype differentiation observed in the tribe Abracrini. Expand
Spreading of heterochromatin and karyotype differentiation in two Tropidacris Scudder, 1869 species (Orthoptera, Romaleidae)
Although the chromosome number and morphology are conserved in the genus, Tropidacris cristata grandis substantially differs from Tropid ACris collaris in terms of the distribution of repetitive sequences, which could contribute to speciation within the genus. Expand
Ommexecha virens (Thunberg, 1824) and Descampsacris serrulatum (Serville, 1831) (Orthoptera, Ommexechidae): karyotypes, constitutive heterochromatin and nucleolar organizing regions
The first chromosomal data, obtained through differential cytogenetics techniques in Ommexechidae, is presented, contributing to a better characterization of karyotypic evolution for this grasshopper family. Expand
Possible origin of B chromosome in Dichotomius sericeus (Coleoptera).
The results suggest an intraspecific and monophyletic origin for B chromosomes in D. sericeus, probably from the second or third autosomal pair. Expand
Wide dispersion of B chromosomes in Rhammatocerus brasiliensis (Orthoptera, Acrididae)
B-chromosome occurrence in populations of R. brasiliensis possibly follows the population genetic structure of the species and, owing to the existence of a variant, its origin may not be recent. Expand