POLYMORPHISM REGENERATION FOR A NEUTRALIZED SELFISH B CHROMOSOME

@article{Zurita1998POLYMORPHISMRF,
  title={POLYMORPHISM REGENERATION FOR A NEUTRALIZED SELFISH B CHROMOSOME},
  author={Sof{\'i}a Gabriela Zurita and Josefa Cabrero and Mar{\'i}a Dolores L{\'o}pez-Le{\'o}n and Juan Pedro M. Camacho},
  journal={Evolution},
  year={1998},
  volume={52}
}
Long‐run evolution of B chromosomes is mainly made up by an evolutionary arms race between these selfish genetic elements and the standard genome. The suppression of B drive is one of the clearest expressions of genome defense against B chromosomes. After drive neutralization, the B is condemned to extinction unless a new variant showing drive can emerge and replace it. This paper reports the first empirical evidence for the substitution of a neutralized B variant by a new selfish B variant… 
Rapid suppression of drive for a parasitic B chromosome
TLDR
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B-chromosome evolution.
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Host recombination is dependent on the degree of parasitism
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TLDR
A natural population of the grasshopper Eyprepocnemis plorans at three time points during the last 35 years is analyzed and the pattern of change observed for genotypic frequencies is consistent with the existence of B chromosome drive through females and selection against individuals with a high number of B chromosomes.
Integration of a B chromosome into the A genome of a wasp
TLDR
The first evidence of a B chromosome that is regularizing its meiotic behaviour and limiting its number to one B chromosome per haploid genome, the same dosage as the standard (A) chromosomes, is found in the solitary wasp Trypoxylon albitarse, suggesting a possible mechanism for B chromosome integration as a regular member of the chromosome complement.
Integration of a B chromosome into the A genome of a wasp, revisited
TLDR
The new results provide a direct report of the invasion process in the Porto Firme population, where B frequency has dramatically increased in only four generations, and the principal B type, the metacentric one, has increased in frequency at the expense of the acrocentric one in several populations.
Chromosomes with a life of their own
TLDR
This review focuses on recent developments in the Bs of rye and maize, two of the species currently receiving most attention, and on the molecular basis of their structural organisation and mechanisms of drive, as well as on their mode of origin and potential applications in plant biotechnology.
Is maize B chromosome preferential fertilization controlled by a single gene?
TLDR
The results are consistent with the hypothesis of a single major gene controlling B transmission rate in maize, which acts in the egg cell at the haploid level during fertilization, and it is hypothesized that maize Bs use the normal maize fertilization process to promote their own transmission.
Selfish genetic elements
TLDR
Though long dismissed as genetic curiosities, with little relevance for evolution, they are now recognized to affect a wide swath of biological processes, ranging from genome size and architecture to speciation.
Post-meiotic B chromosome expulsion, during spermiogenesis, in two grasshopper species
TLDR
It is shown for the first time that most microspermatids formed during spermiogenesis in two grasshopper species contain expulsed B chromosomes, concluding that B chromosome elimination during s permiogenesis is a defense weapon of the host genome to get rid of parasitic chromosomes.
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References

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Among the constellation of selfish genetic elements, including transposons, segregation distorters and some cytoplasmic factors, which make up eukaryote genomes, B chromosomes are in fact the
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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.
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TLDR
Modeling exercises have proved useful in examining these polymorphisms, and of the ones that have been published to date, all have favored drive as the main force generating B-chromosome polymorphisms.
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TLDR
It is concluded that Bs are inherited in a random manner with no tendency toward accumulation or loss from either sex and the possible factors that might be responsible for this widespread polymorphism are discussed.
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TLDR
Paternity analyses using the heterochromatic segment as a marker showed that the effect of male on female transmission does not depend on fertilization because it occurs even when all the eggs are fertilized by sperm from another mating.
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TLDR
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TLDR
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TLDR
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TLDR
Samples of male Eyprepocnemis plorans collected at 30 localities at the Spanish provinces of Malaga and Granada were analyzed to obtain an accurate study of the central area of highest complexity, and the original hypothesis ofsubstitution was confirmed.
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