What is mitosis and Stage of mitosis

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What is the Mitosis division?

Once the chromosome and once the nucleus divide, which divides from one cell to two cells is called mitosis.

What is the Mitosis division?

The term mitosis was first used by Fleming in 1882.  In chromosome both chromatids of each chromosome travel to different poles.

  As a result, the number and morphology of chromosomes in both progeny cells resulting from the mitigation of a cell and their gene fraction are similar between each other and parent cell.

What is the difference between mitosis and meiosis

 Stages of mitosis

1) Interphase

 It has four stages, the following in which DNA is not synthesized.

i) G1.  In this stage where DNA is not synthesized, protein and RNA are synthesized, it takes 12 hours.  This stage is called the first gap or G1.

ii) S.  This is the second stage in which protein and RNA are not synthesized while DNA is synthesized. It takes 6 hours.

iii) G2. There is a synthesis of protein and RNA, it is complete in about 12 hours.  This stage is called the second gap or G2.

iv) M. This is the final stage in which the chromosome splits, completing in 1 hour.

2.) Prophase.

 The main event of the prophase makes the chromosomes visible.  As the size of the nucleus and nucleus increases, the chromosomes begin to form choline, at the end of this phase both the nucleus and nucleus are lost.  These are of two types depending on choline.

a) Plectonic coiling

 Chromatic spirals around each other like rope strands.  They cannot separate from each other without rotating.

b) Paranimic coiling

In this, chromatic is not coiled around each other like rope strands.  They can be easily separated, separated only by pulling without rotating.

3) Metaphase 

Chromosomes in the metaphase are located on the intermediate plaque of the centromere, while their arms may be outside this plaque.  Cells are found in it.  The nucleus is absent.  spindle fiber is produced.  Two poles are found in it.

4) Anaphase

 In the anaphase, both chromatids of each chromosome separate from each other and move to opposite poles.  Cells are found in it.  The nucleus is present.  The cell plate is formed.  spindle fibers are found.

5) Telophase

It consists of the following events in both main groups of chromosomes collected at opposite poles.

i) The chromosomes have acundulans which make them long and thin.
ii)  The nucleus is re-emergent.
iii) Nuclear membrane forms around the chromosome.
iv) The nucleus is found.
v) The cell plate is divided into two parts.

Importance of Mitosis 

The main function of mitosis is the growth and reproduction of tissues.  The following are its various functions.
1. Origin of many identical cells of zygote for growth and development.

2. Reproduction of damaged tissues.

3.  Some old tissues (eg epithelium of the intestine, epithelium) and cells (eg frequent replacement of blood cells).

4. Origin of new organs, such as roots in plants, branches of shoots, etc.

5.  Generating identical progeny of parent plants by asexual reproduction in plants.

 6. Production of gametes from haploid spores arising from the mitosis of plants.


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