减数分裂既是高等生物染色体变异的敏感期，又是变异得以顺利传递给子代的关键期。以黑麦６Ｒ染色体为例，观察其在小麦背景中的减数分裂行为，先是发现６Ｒ抑制小麦同源染色体正常配对，造成单价体数量的增加；同时注意到６Ｒ与其部分同源的小麦染色体６Ｄ几乎不能发生配对。其次是观察到单价体在减数分裂期容易产生断裂的现象，特别是首次发现单价体碎裂，对进一步深入研究异源染色体臂间易位和小片段易位的形成具有借鉴价值。 Meiosis is not only the sensitive period of higher biological chromosome variation, but also the key period when variation can be successfully passed on to offspring. Taking Rye 6R chromosome as an example, we observed the meiosis behavior in the wheat background. We first found that 6R inhibited the normal pairing of wheat homologous chromosomes, resulting in an increase in the number of monovalent. At the same time, we noticed that 6R and its partially homologous chromosome 6D Almost impossible to pair. Secondly, it is observed that the monovalent body is easy to produce the rupture at the meiosis stage, especially the first discovery of the monovalent body fragment, which is of reference value for further study on the formation of transmembranous arm and small fragment translocation.