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Updated: Jul 25, 2026

Expression of Fluorescent Proteins in Branchiostoma lanceolatum by mRNA Injection into Unfertilized Oocytes
09:31

Expression of Fluorescent Proteins in Branchiostoma lanceolatum by mRNA Injection into Unfertilized Oocytes

Published on: January 12, 2015

カメの属StaurotypusのX染色体から派生したものである

J W Sites, J W Bickham, M W Haiduk

    Science (New York, N.Y.)
    |December 21, 1979
    PubMed
    まとめ

    カメのStaurotypus salviniiは,メス (同性性) がオスよりも進化しているユニークな性染色体系を持っています. この発見は,脊椎動物における性染色体進化の一般的なモデルに異議を唱えている.

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    Primordial Germ Cell Transplantation for CRISPR/Cas9-based Leapfrogging in Xenopus

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    X-inactivation01:58

    X-inactivation

    The human X chromosome contains over ten times the number of genes as in the Y chromosome. Since males have only one X chromosome, and females have two, one might expect females to produce twice as many of the proteins, with undesirable results.
    Lampbrush Chromosomes01:51

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    In 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps.
    LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops resemble the...