Holocentric chromosomes in meiosis. II. The modes of orientation and segregation of a trivalent

@article{Nokkala2006HolocentricCI,
  title={Holocentric chromosomes in meiosis. II. The modes of orientation and segregation of a trivalent},
  author={Seppo Nokkala and Valentina G. Kuznetsova and Anna Maryańska-Nadachowska and Christina Nokkala},
  journal={Chromosome Research},
  year={2006},
  volume={14},
  pages={559-565}
}
The modes of orientation and segregation of the sex chromosome trivalent X1X2Y in male meiosis of Cacopsylla mali (Psylloidea, Homoptera) were analysed. Males with an X1X2Y sex chromosome system coexist with males displaying a neo-XY system in populations of this species. The fusion chromosome resulting in the formation of a trivalent in meiosis originates from the fusion of an autosome with the neo-Y chromosome. In the majority of metaphase I cells (92.4%) the X1X2Y trivalent showed co… 
Versatility of multivalent orientation, inverted meiosis, and rescued fitness in holocentric chromosomal hybrids
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The fact that this rearrangement has been found in a natural population of T. infestans and that it shows a regular meiotic behaviour seems to support the suggested hypothesis of karyotype evolution in Heteroptera.
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Conservation and Variability of Meiosis Across the Eukaryotes.
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  • 2016
TLDR
It is confirmed that meiosis originated in the common ancestor of all eukaryotes and suggests that primordial meiosis may have had many characteristics in common with conventional extant meiosis, however, it is possible that the synaptonemal complex and the delicate crossover control related to its presence were later acquisitions.
Comparative analysis of chromosome numbers and sex chromosome systems in Paraneoptera (Insecta)
Abstract This article is part (the 4th article) of the themed issue (a monograph) “Aberrant cytogenetic and reproductive patterns in the evolution of Paraneoptera”. The purpose of this article is to
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