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B-chromosome evolution.
TLDR
Because B chromosomes interact with the standard chromosomes, they can play an important role in genome evolution and may be useful for studying molecular evolutionary processes. Expand
Location and expression of ribosomal RNA genes in grasshoppers: Abundance of silent and cryptic loci
TLDR
The abundance of silent and cryptic loci might suggest that rDNA spreads through grasshopper genomes by the Dubcovsky and Dvorak mechanism—that is, the transposition of a few rRNA genes to new chromosome locations, their amplification giving rise to new NORs, and the elimination of the old NORs. Expand
Structural and functional evidence that a B chromosome in the characid fish Astyanax scabripinnis is an isochromosome
TLDR
The localization of a repetitive DNA sequence on both B chromosome arms, and synaptonemal complex formation, are analyzed in order to test the functional homology of both arms and provide strong support for the hypothesis that the B chromosome is an isochromosome. Expand
Meiotic behaviour of the holocentric chromosomes of Nezara viridula (Insecta, Heteroptera) analysed by C-banding and silver impregnation
TLDR
From cytological analysis, it is deduced that centromeric activity is preferentially located at the two telomeric ends and that the presence of chiasmata at an end excludes such activity. Expand
Frequency increase and mitotic stabilization of a B chromosome in the fish Prochilodus lineatus
TLDR
Six populations of the fish Prochilodus lineatus were analysed for B chromosome frequency, and a study of spermatogenesis revealed the absence of B accumulation during the stages analysed, suggesting that this population was in the final stage of B chromosome invasion. Expand
Population Dynamics of A Selfish B Chromosome Neutralized by the Standard Genome in the Grasshopper Eyprepocnemis Plorans
TLDR
Effects of the B chromosome polymorphism of the grasshopper Eyprepocnemis plorans were analyzed in two natural populations and suggested that the mean time to extinction is proportional to the two‐thirds power of the population size; it is much less affected by subpopulation size or the number of populations in a subdivided population. Expand
Chromosome mapping of H3 and H4 histone gene clusters in 35 species of acridid grasshoppers
TLDR
Chromosome location of H3-H4 histone gene clusters seem to be highly conservative in Acrididae grasshoppers, which is most parsimoniously explained by common ancestry. Expand
High-throughput analysis of the satellitome illuminates satellite DNA evolution
TLDR
The high-throughput analysis of satellite DNA content in the migratory locust by means of the bioinformatic analysis of Illumina reads with the RepeatExplorer and RepeatMasker programs is shown and the term “satellitome” is proposed for the whole collection of different satDNA families in a genome. Expand
A geographic selection mosaic in a generalized plant–pollinator–herbivore system
TLDR
This study investigates whether a geographic selection mosaic for floral traits in a generalist plant, Erysimum mediohispanicum (Brassicaceae), can be mediated by the interplay of mutualistic and antagonistic interacting organisms, and finds four important outcomes. Expand
B chromosome ancestry revealed by histone genes in the migratory locust
TLDR
Strong evidence for B chromosome ancestry in the migratory locust is provided, based on the location of genes for the H3 and H4 histones in the B chromosome and a single A chromosome pair, showing the B-chromosome ability to persist in natural populations for long periods of time. Expand
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