1. Tardigrade
  2. Question
  3. Biology
  4. Match the following column I with column II. Column - I Column - II A. Metaphase - II 1. Centromere with 2 kinetochores B. Anaphase - I 2. Disjunction C. Mitosis 3. Synapse D. Zygotene 4. Plectonemic coiling

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Q. Match the following column I with column II.
Column - I Column - II
A. Metaphase - II 1. Centromere with 2 kinetochores
B. Anaphase - I 2. Disjunction
C. Mitosis 3. Synapse
D. Zygotene 4. Plectonemic coiling

NTA AbhyasNTA Abhyas 2020Cell Cycle and Cell Division

Solution:

The chromosomes become arranged on the metaphase plate, much as the chromosomes do in mitosis, and are attached to the now fully formed spindle. In metaphase II, the centromeres contain two kinetochores that attach to spindle fibers from the centrosomes at opposite poles. The new equatorial metaphase plate is rotated by 90 degrees when compared to meiosis I, perpendicular to the previous plate.
Disjunction of chromosomes takes place in anaphase-I and II when chromosomes move to the opposite poles of the cell.
Plectonemic coiling refers to inter-twining of a double helix DNA molecule in such a way that for its correction unwinding of DNA helix molecule is required, this take place in mitosis in which sister chromatids are tightly coiled upon each other. In the zygotene stage, homologs login to synapse by coming to approximate alignment.