End-to-End Association of <Emphasis Type="Italic">X</Emphasis> and <Emphasis Type="Italic">Y</Emphasis> Chromosomes in Mouse Meiosis |
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Authors: | W SCHNEDL |
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Institution: | 1.Histologisch-Embryologisches Institut der Universit?t,Wien |
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Abstract: | ACCORDING to the hypothesis of Crew and Koller1 and Koller and Darlington2, there are homologous segments in the X and Y chromosomes of the mouse and other mammals. The homologous regions in the mouse were believed to be localized in the extremely short arms proximal to the kinetochores. The end-to-end association at meiosis was thought to be the result of the formation of a chiasma between these homologous regions3. Electron microscopy revealed a short synaptonemal complex in mouse meiotic cells4. However, partial sex linkage has never been demonstrated in the mouse5 and other authors6–10 believe that the X and Y chromosomes associate only by connexion between the chromosome ends furthest from the centromeres. |
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