Aberrant spermatogenesis and the peculiar mechanism of sex determination in Symphypleonan Collembola (Insecta).

@article{Dallai2000AberrantSA,
  title={Aberrant spermatogenesis and the peculiar mechanism of sex determination in Symphypleonan Collembola (Insecta).},
  author={Romano Dallai and Pietro Paolo Fanciulli and Francesco Frati},
  journal={The Journal of heredity},
  year={2000},
  volume={91 5},
  pages={351-8}
}
Light and electron microscopy evidence have been obtained to describe the peculiar spermatogenesis in the collembolan species Sminthurus viridis and Allacma fusca (Sminthuridae). In these two species, the two sexes differ for the lack of two chromosomes (the sex chromosomes) in males (males, 2n = 10; females, 2n = 12). While oogenesis seems to proceed normally, spermatogenesis is peculiar because the two daughter cells of the first meiotic division have different chromosome numbers (six and… CONTINUE READING