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The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
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Frequency and Distribution of Crossovers in Caenorhabditis elegans Meiosis by SNP Genotyping using Real-time PCR
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A WIDESPREAD B CHROMOSOME POLYMORPHISM MAINTAINED WITHOUT APPARENT DRIVE.

M D Lopez-Leon1, J Cabrero1, J P M Camacho1

  • 1Departamento de Genética, Facultad de Ciencias, Universidad de Granada, E-18071, Granada, SPAIN.

Evolution; International Journal of Organic Evolution
|June 1, 2017
PubMed
Summary
This summary is machine-generated.

B chromosomes in the grasshopper Eyprepocnemis plorans are inherited randomly. This study investigated B chromosome transmission rates, finding no sex-specific accumulation or loss, suggesting factors maintain this polymorphism.

Keywords:
Accumulation mechanismsB chromosomesEyprepocnemis ploransgrasshoppersheteroticparasitic

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Area of Science:

  • Genetics
  • Evolutionary Biology
  • Cytology

Background:

  • B chromosomes are accessory chromosomes found in various organisms.
  • Their transmission patterns can significantly impact genome evolution and population dynamics.
  • The grasshopper Eyprepocnemis plorans exhibits B chromosome polymorphism.

Purpose of the Study:

  • To investigate the transmission rates of three main B chromosome types in Eyprepocnemis plorans.
  • To determine if B chromosomes accumulate or are lost in specific sexes.
  • To explore potential mechanisms maintaining B chromosome polymorphism.

Main Methods:

  • Cytological observation of meiotic behavior in male and female grasshoppers.
  • Karyological analysis of embryo offspring from field-collected and experimentally crossed individuals.

Main Results:

  • B chromosome transmission was found to be random in Eyprepocnemis plorans.
  • No evidence of biased accumulation or loss of B chromosomes was observed in either sex.
  • Inheritance patterns suggest a stable maintenance of B chromosome polymorphism.

Conclusions:

  • The random inheritance of B chromosomes contributes to their stable maintenance in Eyprepocnemis plorans populations.
  • Factors other than biased meiotic drive likely regulate B chromosome polymorphism.
  • Further research is needed to elucidate the specific evolutionary forces maintaining B chromosome diversity.