Mitosis

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Mitosis

Definition

Mitosis is a type of cell division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus, typical of ordinary tissue growth.

Cells

In mitosis, a cell duplicates all of its contents, including its chromosomes, and it splits to form two identical daughter cells. This process is so critical, the steps of mitosis are carefully controlled by a number of genes. When mitosis is not regulated correctly, health problems such as cancer can occur.

It takes about 2 hours for mitosis to complete. Cells will take between 5 and 6 hours to complete S phase. G2 takes 3 to 4 hours in most cells. In total interphase generally takes between 18 and 20 hours. Mitosis takes about 2 hours where the cell makes preparations and completes cell division .

Purpose and Importance

Mitosis is important because it is necessary for the growth and repair of the body.The purpose of mitosis is to replace worn out cells. Mitosis occurs when a parent cell divides into two identical copies referred to as daughter cells. In this process the daughter cells have the same exact DNA.

Phases and Interphase

Stages

There are 3 stages in Mitosis. Stage 1 is G1 and in this stage the cell grows. Stage 2 is S and in this stage DNA relplication occurs. Stage 3 is G2 and in this stage the cell prepares for mitosis.

Cytokinesis

Cytokinesis is the third stage and also a part of the cell division process. During this process the cytoplasm of a single eukaryotic cell divides into two daughter cells. Cytokinesis takes place in Anaphase and Telophase.

Telophase

Telophase is the second stage of cell division after Prophase Metaphase and Anaphase. In this phase the chromosomes move to opposite ends of the cell and two nuclei are formed.

Anaphase

Anaphase is the second stage of cell division after Metaphase before Telophase. In this phase the chromosomes move away from one another to opposite poles of the spindle.

Metaphase

Metaphase is the second stage of cell division after Prophase and before Anaphase. In this phase the chromosomes become attached to the spindle fibers.

Prophase

Prophase is the second stage of cell division. In this phase the chromosomes become visible and the nuclear envelope disappears.

Interphase

Interphase is the longest part of the cell cycle. Interphase is the first stage. This is where the cell grows and copies its DNA before moving into mitosis. Meiosis and Mitosis are both apart of cell division.