D.N.A. and the Chromosomes
نویسندگان
چکیده
منابع مشابه
Tangled DNA tightens chromosomes
Tangled DNA tightens chromosomes C ramming your vacation wardrobe into your luggage is a breeze compared with the packing job cells perform. Before they can divide, they have to scrunch long DNA molecules into tiny chromosomes. The tangles that form in DNA molecules help this chromosome compression, Kawamura et al. report. The team studies newt chromosomes—they are large and convenient to obser...
متن کاملPacking DNA into chromosomes.
Electron microscopy of HeLa metaphase nucleoids (i.e. whole metaphase cells exposed to 2 M salt and non-ionic detergent) spread by the Kleinschmidt technique, reveals a variety of protein-depleted structures (spreads) derived from chromosomes. Spreads vary in size and shape. At one extreme are oval structures with one or more cores surrounded by a network of supercoiled fibres. These fibres are...
متن کاملThe terminal DNA structure of mammalian chromosomes.
In virtually all eukaryotic organisms, telomeric DNA is composed of a variable number of short direct repeats. While the primary sequence of telomeric repeats has been determined for a great variety of species, the actual physical DNA structure at the ends of a bona fide metazoan chromosome with a centromere is unknown. It is shown here that an overhang of the strand forming the 3' ends of the ...
متن کاملCompeting chromosomes explain junk DNA.
sciencemag.org SCIENCE Paleoindian, and fishtail points previously provided a roadmap that archaeologists used to trace the spread of Paleoindians throughout the Americas. Such a roadmap is lacking for pre-Clovis sites. Assemblages with distinctive stemmed (“tanged”) chipped-stone projectile points, crescents (lunate-shaped), and leaf-shaped bifaces found in Japan, northeast Asia, western North...
متن کاملGeneration and annotation of the DNA sequences of human chromosomes
LaDeana W. Hillier, Tina A. Graves, Robert S. Fulton, Lucinda A. Fulton, Kymberlie H. Pepin, Patrick Minx, Caryn Wagner-McPherson, Dan Layman, Kristine Wylie, Mandeep Sekhon, Michael C. Becker, Ginger A. Fewell, Kimberly D. Delehaunty, Tracie L. Miner, William E. Nash, Colin Kremitzki, Lachlan Oddy, Hui Du, Hui Sun, Holland Bradshaw-Cordum, Johar Ali, Jason Carter, Matt Cordes, Anthony Harris, ...
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ژورنال
عنوان ژورنال: BMJ
سال: 1963
ISSN: 0959-8138,1468-5833
DOI: 10.1136/bmj.1.5325.258-b