B chromosomes in Rattus fuscipes I. Mitotic and meiotic chromosomes and the effects of B chromosomes on chiasma frequency
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چکیده
منابع مشابه
Polymer models of meiotic and mitotic chromosomes.
Polymers tied together by constraints exhibit an internal pressure; this idea is used to analyze physical properties of the bottle-brush-like chromosomes of meiotic prophase that consist of polymer-like flexible chromatin loops, attached to a central axis. Using a minimal number of experimental parameters, semiquantitative predictions are made for the bending rigidity, radius, and axial tension...
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Meiotic recombination between a circular and a linear chromosome in Saccharomyces cerevisiae has been investigated. The circle was a haploid-viable derivative of chromosome III constructed by joining regions near the two chromosome ends via a recombinant DNA construction: (HMR/MAT-URA3-pBR322-MAT/HML) and was also deleted for MAL2 (which therefore uniquely marks a linear chromosome III). Recomb...
متن کاملB chromosomes in Brazilian rodents.
B chromosomes are now known in eight Brazilian rodent species: Akodon montensis, Holochilus brasiliensis, Nectomys rattus, N. squamipes, Oligoryzomys flavescens, Oryzomys angouya, Proechimys sp. 2 and Trinomys iheringi. Typically these chromosomes are heterogeneous relative to size, morphology, banding patterns, presence/absence of NORs, and presence/absence of interstitial telomeric signals af...
متن کاملEffects of B Chromosomes on the A Genome
ABC Fax + 41 61 306 12 34 E-mail [email protected] www.karger.com © 2004 S. Karger AG, Basel 0301–0171/04/1064–0320$21.00/0 Accessible online at: www.karger.com/cgr Abstract. In rye each B chromosome (B) represents 5.5% of the diploid A genome. Rye Bs have several nuclear to whole plant effects although they seem to bear no genes except for the ones that lead to their maintenance within a popula...
متن کاملB chromosomes and sex in animals.
Supernumerary (B) chromosomes are dispensable elements found in many eukaryote genomes in addition to standard (A) chromosomes. In many respects, B chromosomes resemble sex chromosomes, so that a common ancestry for them has frequently been suggested. For instance, B chromosomes in grasshoppers, and other insects, show a pycnotic cycle of condensation-decondensation during meiosis remarkably si...
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ژورنال
عنوان ژورنال: Heredity
سال: 1984
ISSN: 0018-067X,1365-2540
DOI: 10.1038/hdy.1984.43