We are never ever, ever getting back together – Mitosis

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Mitosis
ThoughtCo

The title “We are never ever, ever getting back together- cell division” means that the two daughter cells formed as a result of Mitosis never going to return to became parent cells again. This article focuses on mitotic cell division.

To read the introductory part of cell division, go through the link –https://www.anthromania.com/2021/06/16/how-cells-in-our-body-divide/

Mitosis 

Mitos means thread or fibril. Mitosis term is given by Flemming (1882).

Mitosis, also known as Equational Division or Somatic cell division which refers that chromosomes equally distributed both quantitatively and qualitatively from parent cells to two daughter nuclei. This division maintains the chromosomes no. for generations.

Mitosis involves the division of the nucleus which is followed by the division of the cytoplasm. When the cell is not ready to divide then it is known as the Interphase stage. During this phase, chromosomes are not clearly visible.

Mitosis (photo- Adobe Stock)

An elaborate process is necessary for forming two daughter cells out of the parent cell. The whole process studied under 4 stages

Prophase

Mitosis-Prophase (photo- SlideShare)

Chromosomes visible as long, slender and coiled thread. They get shorten and thicken.

Each chromosome is seen to be made of two identical strands known as Chromatids lined against each other throughout the length. A chromosome bears a constriction, a region of attachment of two chromatids at a single point known as centromere or kinetochore.

During this stage, the nucleus and nuclear membrane disappear and a spindle shape body known as a nuclear spindle or mitotic spindle is formed.

As prophase advances, the chromatids become closely coiled and the double nature of chromosomes disappear.

Metaphase

Mitosis- Metaphase (photo- Let’s Talk Science)

During this phase, the chromosomes radially oriented in the equatorial plane. The two chromatids lie parallel to each other. The spindle extends into the nuclear area and occupies the centre of the cell. The spindle gets attached to the centromere. Fibres of the spindle that are attached with chromosomes are called the chromosomal fibres (discontinuous fibres or tactile fibres) while others are known as continuous fibres.

Anaphase

Mitosis- Anaphase (photo- Britannica)

In this stage, the chromosomes begin to disappear. Each centromere divides equally. First, the two centromeres and later on the chromatids are pulled apart. The two half or the identical sets of chromatids move to the opposite poles of the spindle. Thus the two chromatids become separated from each other. Each group contains the same no. of chromosomes.

Telophase

Mitosis- Telophase (photo- English Tenses)

It is the reverse of prophase. During this phase, nuclear envelop forms around each group at the opposite poles. The spindles disappear. Now the cell membrane gets constricted in between which results in the formation of two daughter cells. Each daughter cell has the same amount of cytoplasm and nucleus.

Significance of mitosis

  • Equal distribution of chromosomes in the daughter cells in terms of quality and quantity.
  • Maintains constant no. of chromosomes from generation to generation in all body cells of an organisms.
  • Maintains purity of gametes.

Read more :

Also, read other science-related topics-

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