These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: [Morphology and behavior of the sex chromosomes in meiosis in four vole species of the genus Microtus].
    Author: Borodin PM, Alblina OV, Zakiian SM, Nesterova TN, Meĭer MN.
    Journal: Genetika; 1991 Jun; 27(6):1059-65. PubMed ID: 1773934.
    Abstract:
    Morphology and behaviour of the X and Y chromosomes of four species of genus Microtus were studied at pachytene, metaphase I and meiotic metaphase. The X chromosomes of the species varied with respect to their size and location of heterochromatic blocks. The axes of X and Y chromosomes of these species as well as Microtus agrestis never formed true synaptonemal complexes at any sub-stage of the pachytene. They approached each other at the start of the pachytene throughout to metaphase I, getting situated closely. At the end of the pachytene, they formed sex vesicle. The X and Y chromosomes kept their proximity during metaphase I, but never formed true bivalents. It is suggested that lack of synapsis of the X and Y chromosomes in the genus Microtus is the final step of evolutionary trend to reduction of the size of the pseudo-autosomal region. The abolition of restrictions on homology between the X and Y chromosomes is supposed to be a cause for the fast divergence in morphology of sex chromosomes in the genus.
    [Abstract] [Full Text] [Related] [New Search]