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Updated: Apr 30, 2026

Generation and Isolation of Cell Cycle-arrested Cells with Complex Karyotypes
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遗传学分析揭示了类动物的进化过程

Torsten H Struck1, Christiane Paul, Natascha Hill

  • 1University of Osnabrück, FB05 Biology/Chemistry, AG Zoology, Barbarastrasse 11, 49069 Osnabrück, Germany. struck@biologie.uni-osnabrueck.de

Nature
|March 4, 2011
PubMed
概括

遗传学分析揭示了Annelida (环状虫) 的进化历史,澄清了像Errantia和Sedentaria这样的主要类别之间的关系. 这项研究重建了形生命树,提供了对身体规划进化的见解.

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During meiosis, chromosomes occasionally separate improperly. This occurs due to failure of homologous chromosome separation during meiosis I or failed sister chromatid separation during meiosis II. In some species, notably plants, nondisjunction can result in an organism with an entire additional set of chromosomes, which is called polyploidy. In humans, nondisjunction can occur during male or female gametogenesis and the resulting gametes possess one too many or one too few chromosomes.
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Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female...
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Evolutionary Relationships through Genome Comparisons

Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
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Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate correctly and move to the opposite poles of the cells. This produces daughter cells with abnormal chromosome numbers.  Nondisjunction is common during anaphase I or anaphase II of meiosis.  Mutations in synaptonemal complex proteins that attach homologous chromosomes increase the chances of nondisjunction in anaphase I of meiosis I. In contrast, mutations in topoisomerases and condensins that hold...
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