Meiotic studies of Robertsonian polymorphisms in the South American marsh rat, Holichilus brasiliensis.

@article{Nachman1992MeioticSO,
  title={Meiotic studies of Robertsonian polymorphisms in the South American marsh rat, Holichilus brasiliensis.},
  author={Michael W Nachman},
  journal={Cytogenetics and cell genetics},
  year={1992},
  volume={61 1},
  pages={17-24}
}
Meiosis was studied in male South American marsh rats (1) to help clarify the mechanisms that allow unusually high levels of Robertsonian (Rb) polymorphisms to be maintained in wild populations of these animals and (2) to test competing assumptions in two distinct models of chromosomal speciation. In both simple Rb heterozygotes and Rb heterozygotes with monobrachial homology, no univalency was observed in prophase I or metaphase I. Rates of nondisjunction were uniformly low (less than 10%) and… CONTINUE READING

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