染色体异常的检测可以通过chorionic villus sampling 和amniocentesis进行,这两种方式都有可能会造成胎儿流产(miscarriage)的发生,所以在必要的时候才会进行。 上图的non-disjuction是发生在anaphase I,如果发生在anaphase II时会是什么结果? 练习题 链接为Google Forms形式的18道练习题,做完提交后会显示分数和正确答案。
However, meiosis 1 is going to differ significantly in both metaphase 1 as well as anaphase 1. Because it's just metaphase 1 and anaphase 1 that differ significantly, this is where we're going to put most of our focus. Notice that our image, down below, has these two phases in blue ...
Anaphase 1:The homologs are pulled apart, producing two daughter chromosome sets that are not identical because of crossing over. Eachchromosomestill consists of chromatids with all 23 centromeres in each nucleus intact. Telophase 1:The cell divides. Mitosis 2 is simply a mitotic division with th...
Background: Meiotic pairing is essential for the proper orientation of chromosomes at the metaphase plate and their subsequent disjunction during anaphase ... J Vazquez,AS Belmont,JW Sedat - 《Current Biology》 被引量: 279发表: 2002年 Mutation of the rice gene PAIR3 results in lack of bivalent...
The separation of one nucleus into two was observed at late anaphase-I, prophase-II, late anaphase-II and telophase-II. The multipolar spindles were generally tripolar. At prophase-II microsporocytes with 3 nuclei were most common, 4 nuclei were infrequent, 5 were rare. At telophase-II ...
anaphase d. telophase Which stage of the cell cycle (prophase, metaphase, anaphase, telophase, cytokinesis, or phases of interphase Growth 0, Growth 1, Synthesis, Growth 2) matches the following description? Copied chromosomes align in the middle of the cell. In which phase of mitosis is th...
The formation of DNA double-strand breaks, subsequent repair by homologous recombination and main- tenance of the resultant chiasma between homologous chromosomes until anaphase are essential for correct segregation. Studies in mouse models have revealed that impairment of these processes during early ...
2. Prophase I (leptotene) 3. Prophase I (zygotene and pachytene) 4. Prophase I (diplotene) 5. Prophase I (diakinesis) 6. Metaphase I 7. Anaphase I 8. Telophase I, cytokinesis I, interkinesis, prophase II and metaphase II 9. Anaphase II 10. Telophase II and cytokinesis II Packing:...
Which phase of the cell cycle would cytokinesis begin to divide the the cytoplasm of the cells (and therefore create 2 new daughter cells)? a. Interphase b. Prophase c. Metaphase d. Anaphase e. Telophase A single cell grows into a multice...