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Paarungsverhalten der Geschlechtschromosomen in der männlichen Meiose von Microtus agrestis

Pairing behaviour of the sex chromosomes during male meiosis of Microtus agrestis

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Abstract

In premeiotic stages of the male, the entire Y chromosome and the heterochromatio 3/4 of the X chromosome remain heavily condensed. Pairing of the sex chromosomes does not occur during zygotene. The sex vesicle stage lasts from middle pachytene to the beginning of diplotene. At the more advanced diplotene stages, X and Y lie again separate; chiasma formation has not been observed. Thus, it seems improbable that any pairing occurs at all between X and Y during meiosis. The findings support the hypothesis that heterochromatin does not participate in meiotic exchange, independent of possible homologies between the chromosome segments.

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Authors and Affiliations

  1. Institut für Humangenetik und Anthropologie der Universität Freiburg i. Br., Deutschland

    Maria Teresa Zenzes & Ulrich Wolf

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  1. Maria Teresa Zenzes
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  2. Ulrich Wolf
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Zenzes, M.T., Wolf, U. Paarungsverhalten der Geschlechtschromosomen in der männlichen Meiose von Microtus agrestis . Chromosoma 33, 41–47 (1971). https://doi.org/10.1007/BF00326382

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  • DOI: https://doi.org/10.1007/BF00326382

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