Mitosis: The Process of Cell Division

The stages of mitosis in cell cycle are a complex series of events that ensure the accurate duplication and distribution of genetic material. This page provides a comprehensive overview of the mitotic process, including interphase, mitosis, and cytokinesis.

Definition: Mitosis is the process when a diploid (2n) cell duplicates to create another diploid cell (2n), occurring in all body (somatic) cells except sex cells.

The cell cycle begins with interphase, which is not technically part of mitosis but is crucial for preparing the cell for division. During interphase, the cell grows and replicates its DNA.

The 4 stages of mitosis are as follows:

1. Prophase mitosis: This is the first stage where significant changes occur. The chromosomes condense, the nuclear membrane breaks down, and the spindle fibers begin to form.

Vocabulary: Centrosomes, which contain centrioles, form next to the nucleus and are responsible for organizing the spindle fibers.

2. Metaphase: Chromosomes align along the cell's equator, attached to spindle fibers.

3. Anaphase: Sister chromatids separate and move to opposite poles of the cell.

4. Telophase: The final stage where chromosomes decondense, and nuclear membranes reform around the two new sets of chromosomes.

Highlight: After the chromatids separate in anaphase, they are considered individual chromosomes.

Following telophase, cytokinesis occurs, which is the physical division of the cell's cytoplasm.

Example: The cell membrane pinches in the middle (cleavage furrow) to separate the two daughter cells.

The stages of mitosis diagram can be summarized with the acronym PMAT (Prophase, Metaphase, Anaphase, Telophase).

Quote: "PMAT: Prophase: Chromosomes condense, Metaphase: Chromosomes align, Anaphase: Chromosomes separate, Telophase: Chromosomes relax"

Understanding the detailed steps of mitosis process in order is crucial for grasping how cells grow, repair, and maintain themselves throughout an organism's life.