title: [Nature and role of accessory chromosomes in silver-gray foxes. IV. The behavior of accessory chromosomes in meiosis].
abstract: Comparison of chromosome number at somatic and spermatogonial mitoses has demonstrated the increase in the number of additional chromosomes in cells of germinal tissue. This may evidence a mechanism of B-chromosomes accumulation in foxes. B-chromosomes may lag as univalents, may form bivalent associations, or occasionally form trivalents at the stage of diakinesis-metaphase I, and they may associate with macrobivalents (A-chromosome bivalents). The analysis of metaphase II has shown that the distribution of B-chromosomes in the second metaphase is random resulting in gametes with various numbers of B-chromosomes.
mesh_terms: D000818:Animals; D001853:Bone Marrow / Q000648:ultrastructure; D002875:Chromosomes / Q000502:physiology*; D005589:Foxes / Q000235:genetics*; D008297:Male; D008540:Meiosis; D008677:Metaphase; D008938:Mitosis; D013093:Spermatogonia / Q000648:ultrastructure
vernacular_title: Issledovanie prirody i roli dobavochnykh khromosom serebristochernykh lisits. Soobschchenie IV. Povedenie dobavochnykh khromosom v meĭoze.