• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Belgian Journal of Zoology >C-heterochromatin and chiasma terminalization in the jerboas Allactaga and Jaculus (Rodentia : Dipodidae)
【24h】

C-heterochromatin and chiasma terminalization in the jerboas Allactaga and Jaculus (Rodentia : Dipodidae)

机译：C-异染色质和Jerboas Allactaga和Jaculus中的chiasma末端化（Rodentia：Dipodidae）

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

C-heterochromatin and chiasma distribution patterns of meiotic chromosomes were studied in the dipodids Allactaga tetradactyla, Jaculus jaculus jaculus and Jaculus orientalis and chiasma terminalization was discussed. Darkly stained C-band located at the centromeric region of some bivalents was observed in all species at diakinesis and metaphase I. Of the occurrence of C-heterochromatin in the 24 bivalents, J. orientalis exhibited the highest percentage of absence of the C-blocks, where it was 68.8%, compared to 18.8% in A. tetradactyla and 14.6% in J.j.jaculus. Analysis of variance of the means of relative distances of interstitial and terminal chiasmata from the centromere in the larger bivalents no. 1 and 2 of each species at diakinesis and metaphase I showed that the interstitial chiasmata are stable in their positions at the two stages and do not move to the chromosome termini, while the terminal chiasmata scored at diakinesis are in fact achiasmatic terminal associations and some of them gradually terminalize at metaphase I. Therefore, it is concluded that C-heterochromatin pattern of meiotic chromosomes is quite similar to that of mitotic chromosomes except the pair no. I in A. tetradactyla, stability of interstitial chiasmata at the two stages might negate the idea of chiasma terminalization and C-heterochromatin has not any role in the distribution of chiasmata.
机译：研究了二足类Allactaga quaddactyla，Jaculus jaculus jaculus和Jaculus Orientalis的减数分裂染色体的C-异染色质和chiasma分布模式，并讨论了chiasma的末端化。在diakinesis和中期I的所有物种中均观察到位于某些二价着丝粒区域的深色C带。在24个二价中C-异染色质的发生中，东方乔丹菌表现出最高的不存在C嵌段的百分比，该比例为68.8％，而四指拟南芥中为18.8％，而Jjjaculus中为14.6％。在较大的二价体中，间隙和末梢眼线距着丝粒的相对距离平均值的方差分析。诊断和中期I的每个物种的1和2表明，间质性Chismata在两个阶段的位置稳定，并且不移动到染色体末端，而在Diakinesis评分的终末Chiamata实际上是近视失调的终末关联，其中一些因此，可以得出结论，减数分裂染色体的C-异染色质模式与有丝分裂染色体的模式非常相似，除了成对的对。在四足d中，间质性横纹肌瘤在两个阶段的稳定性可能会否定横纹肌终末的想法，C-异染色质在横纹肌瘤的分布中没有任何作用。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号