Mitosis occurs in the somatic (body) cells of eukaryotic organisms. Before mitosis begins, the cell passes through interphase, during which it grows and duplicates its DNA. This ensures that each daughter cell receives a complete set of chromosomes.

The first stage of mitosis is prophase. During this stage, chromosomes become visible as condensed structures. Each chromosome consists of two sister chromatids joined at a centromere. The nuclear membrane starts to disappear, and spindle fibers begin to form.

The second stage is metaphase. Chromosomes align at the center of the cell along the metaphase plate. Spindle fibers attach to the centromeres of the chromosomes, preparing them for separation.

The third stage is anaphase. Sister chromatids separate and move toward opposite poles of the cell. Each chromatid then becomes an individual chromosome.

The fourth stage is telophase. Chromosomes arrive at opposite poles and begin to decondense. New nuclear membranes form around each set of chromosomes, creating two identical nuclei.

After telophase, cytokinesis occurs. During cytokinesis, the cytoplasm divides, resulting in the formation of two separate daughter cells. Each daughter cell contains the same genetic information and the same number of chromosomes as the parent cell.

Mitosis is crucial for the growth of multicellular organisms. It allows an organism to increase in size, replace damaged cells, and repair injured tissues. In humans, millions of cells undergo mitosis every second.

The process is tightly regulated because errors in mitosis can lead to abnormal chromosome numbers or uncontrolled cell division. Such abnormalities may contribute to diseases, including cancer.

Conclusion

Mitosis is a fundamental biological process that produces two genetically identical daughter cells from one parent cell. It ensures growth, tissue repair, and the maintenance of healthy organisms while preserving genetic stability from one cell generation to the next.