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  • In cell cycle, during which phase chromosomes are arranged in equatorial plate?Option: 1 TelophaseOptio

In cell cycle, during which phase chromosomes are arranged in equatorial plate?

Option: 1

Telophase


Option: 2

Prophase


Option: 3

Metaphase


Option: 4

Anaphase


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 nucleolus reappears.
  • It is followed by the division of the cytoplasm

 

During metaphase, chromosomes move towards equatorial plane of spindles or metaphasic plate. Chromosomes are arranged with their arms directed towards pole and centromere towards equator.

Posted by

Divya Prakash Singh

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