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  • During mitosis, ER and nucleolus begin to disappear at:  Option: 1 Late prophase  <stro

During mitosis, ER and nucleolus begin to disappear at:
 

Option: 1

Late prophase
 


Option: 2

Early metaphase
 


Option: 3

Late metaphase
 


Option: 4

Early prophase
 


Answers (1)

best_answer

 

 

 

The karyokinesis of mitosis can be studied under the following heads:

1. Prophase: 

  • During this stage the chromatin condenses and the chromosomes are visible.
  • The nucleolus disappears and the nuclear envelope fragments.
  • With the disappearance of the nuclear membrane, the centrioles migrate to the opposite end and the spindle formation occurs.
  • Till prophase, the chromosomes have no particular orientation because the spindle has not yet formed.
  • During late prophase or prometaphase, kinetochores appear on each side of the centromere. 
  • The sister chromatids are attached to the so called kinetochore spindle fibers with the help of kinetochore.


2. Metaphase:

  • Chromosomes become fully condensed and distinct.
  • Chromosomes move towards equatorial plane of spindles or metaphasic plate.
  • Chromosomes are arranged with their arms directed towards pole and centromere towards equator.


3. Anaphase: 

  • The centromere splits and the two chromatids of the duplicated chromosomes separate from each other.
  • Each chromatid now becomes a daughter chromosome.
  • Daughter chromosomes, each with a centromere and single chromatid appear to move toward opposite poles.
  • Anaphase is the shortest phase of mitosis.

4. Telophase:

  • During this phase, the spindle disappears and new nuclear envelopes develop around the daughter chromosomes.
  • Each daughter nucleus contains the same number and kinds of chromosomes as the original parent cell.
  • The chromosomes become diffuse chromatin and the nucleolus reappears.
  • It is followed by the division of the cytoplasm

 

The disintegration of ER and nucleolus occurs during early prophase.

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