Q23 / 180 · NEET 2017 · Botany

Which of the following options gives the correct sequence of events during mitosis?

  • A
    codensation → nuclear membrane disassembly → crossing over → segregation → telophase
  • Correct answer
    B
    condensation → nuclear membrane disassembly → arrangement at equator → centromere division → segregation → telophase
  • C
    condensation → crossing over → nuclear membrane disassembly → segregation → telophase
  • D
    condensation → arrangement at equator → centromere division → segregation → telophase

Solution

The correct sequence of events during mitosis would be as follows

(i) Condensation of DNA so that chromosomes become visible occurs during early to mid-prophase.

(ii) Nuclear membrane disassembly begins at late prophase or transition to metaphase.

(iii) An arrangement of chromosomes at equator occurs during metaphase, called congression.

(iv) Centromere division or splitting occurs during anaphase forming daughter chromosomes.

(v) Segregation also occurs during anaphase as daughter chromosomes separate and move to opposite poles.

(vi) Telophase leads to the formation of two daughter nuclei.

Hence, the correct answer is option: 'B'.

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