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Chromosome variation in British populations of Oncopsis (Hemiptera:Cicadellidae)
TLDR
The British species of Oncopsis fall into two groups with respect to male karyotype: Montane populations which occur on Betula pubescens are XO-monomorphic whereas populations in lowland woodlands are polymorphic, including both XO and neo-XY types. Expand
Functional aspects of satellite DNA and heterochromatin.
TLDR
This chapter discusses the functional aspects of satellite DNA and heterochromatin, which suggest that closely related species appear to modulate their satellites from a common library. Expand
Equilocality of heterochromatin distribution and heterochromatin heterogeneity in acridid grasshoppers
TLDR
Comparative fluorescence studies on the chromosome of ten species of acridid grasshoppers indicate that the only regions to fluoresce differentially are those that C-band, and that structural rearrangements that lead to the relocation of centric C-bands, either within or between species, may also be accompanied by a change in fluorescence behaviour. Expand
Inter-population sex chromosome polymorphism in the grasshopper Podisma pedestris
The montane grasshopper Podisma pedestris exists in Europe in two chromosomally distinct kinds of population. One has an XO/XX sex chromosome mechanism and a diploid chromosome number of 23 male, 24Expand
Inter-population sex chromosome polymorphism in the grasshopper Podisma pedestris
TLDR
The available evidence points to the neo-XY system having evolved following a secondary movement of the species into the higher ground it now occupies after the climatic amelioration at the end of the last ice age. Expand
The Eukaryote Genome in Development and Evolution
TLDR
The general molecular organization of Drosophila genomes is studied, including Gene regulation in eukaryotes, and the role of DNA methylation and gene activity in development. Expand
Regularities and restrictions governing C-band variation in acridoid grasshoppers
TLDR
Differences in the number of very small chromosomes present in different species clearly cannot be explained in terms of differences in their C-band content, indicating that changes in the size of the genome in this group have involved alterations in both eu and heterochromatin content. Expand
Population cytogenetics of Atractomorpha similis
TLDR
The populations from Fraser Island constitute a particularly distinctive cytotype characterised by the least number of morphs, the lowest level of chromosomal heterozygosity and a restricted range of heterochromatin content confined to the lower end of the known distributional spectrum. Expand
Heterochromatin and satellite DNA in man: properties and prospects.
TLDR
The ubiquity of naturally occurring heterochromatic polymorphisms, coupled with the extreme sensitivity of the human genome to perturbation, offers some scope for assessing the possible somatic effects of alterations in the amount of satellite DNA. Expand
Myths and mechanisms of meiosis
  • B. John
  • Biology, Medicine
  • Chromosoma
  • 10 March 1976
TLDR
A comparative analysis of the meiotic secquence in a wide variety of organisms indicates there is no convincing evidence that premeiotic pairing plays any role in the synapsis of homologues and there is good evidence that interlocking of bivalent can occur regularly in species with a chiasma frequency sufficiently high to regularly produce ring bivalents. Expand
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