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Cytokinesis:
Mitosis completes duplicated chromosomes into daughter nuclei, But the cell itself is divided into daughter cells.Cytokinesis is the process by which the cytoplasm of a parent cell divides into two daughter cells.
- In the middle of the cell membrane, constriction appears.
- It continues to deepen.
- It further divides the cytoplasm into two, thus producing new daughter cells from the parent cell.
Cytokinesis eukaryotic mitosis
Significance of mitosis:
The process of mitosis is a great significance in the life of an organism.
Maintenance of chromosome number: Mitosis involves an equational division resulting in diploid daughter cells' formation with the same chromosome number as that of a mother cell. It helps to maintain the diploid (\(2n\)) number of chromosomes in daughter cells.
Growth: All the somatic cells are formed by mitosis, and thus it plays a vital role in the growth, organ development and increase in body size of a multicellular organism.
Repair: This process helps to repair the damaged and wounded tissue by renewal the lost cells.
Regeneration: It is involved in the replacement of old and dead cells by forming new cells.
Reproduction: Unicellular organisms are multiplies by this method.
Info bit:
Age of our body cells:• Cells of the eye lens, nerve cells of cerebral cortex and most muscle cells last a lifetime but once dead are not replaced.
• Epithelial cells lining the gut last only about \(5\) days.
• Average life of other gut cells is about \(15\) years.
• Epithelial cells lining the gut last only about \(5\) days.
• Average life of other gut cells is about \(15\) years.
Duration of cell replacement:
• Skin cells - about every two weeks.
• Bone cells - about every ten years.
• Liver cells - about every \(300\) – \(500\) days.
• Red blood cells last for about \(120\) days and are replaced.
Reference:
https://upload.wikimedia.org/wikipedia/commons/e/e0/Cytokinesis_eukaryotic_mitosis.svg
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