Mitosis | Definition, Stages, Diagram, & Facts | Britannica

Home » What Type Of Reproduction Is Mitosis » Mitosis | Definition, Stages, Diagram, & Facts | Britannica

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mitosis, a process of cell duplication, or reproduction, during which one cell gives rise to two genetically identical daughter cells. Strictly applied, the term mitosis is used to describe the duplication and distribution of chromosomes, the structures that carry the genetic information.

A brief treatment of mitosis follows. For a full treatment, see growth: In cells; cell: Mitosis and cytokinesis.

Each stage in the cell cycle, explained1 of 2
Each stage in the cell cycle, explainedThe cell cycle has two main phases: interphase and mitosis.(more)See all videos for this article
The four general phases of Mitosis explained2 of 2
The four general phases of Mitosis explainedMitosis has four stages: prophase, metaphase, anaphase, and telophase.(more)See all videos for this article

Prior to the onset of mitosis, the chromosomes have replicated and the proteins that will form the mitotic spindle have been synthesized. Mitosis begins at prophase with the thickening and coiling of the chromosomes. The nucleolus, a rounded structure, shrinks and disappears. The end of prophase is marked by the beginning of the organization of a group of fibres to form a spindle and the disintegration of the nuclear membrane.

Why are children slightly different from their parents? More From Britannica heredity: During mitosis
Centromere and chromatids in cell division
Centromere and chromatids in cell divisionDuring the first stages of cell division, the recognizable double-stranded chromosome is formed by two tightly coiled DNA strands (chromatids) joined at a point called the centromere. During the middle stage of cell division, the centromere duplicates, and the chromatid pair separates. Following cell division, the separated chromatids uncoil; the loosely coiled DNA, wrapped around its associated proteins (histones) to form beaded structures called nucleosomes, is termed chromatin.(more)

The chromosomes, each of which is a double structure consisting of duplicate chromatids, line up along the midline of the cell at metaphase. In anaphase each chromatid pair separates into two identical chromosomes that are pulled to opposite ends of the cell by the spindle fibres. During telophase, the chromosomes begin to decondense, the spindle breaks down, and the nuclear membranes and nucleoli re-form. The cytoplasm of the mother cell divides to form two daughter cells, each containing the same number and kind of chromosomes as the mother cell. The stage, or phase, after the completion of mitosis is called interphase.

Key People: Walther Flemming Daniel Mazia (Show more) Related Topics: meiosis cleavage cell division endomitosis (Show more) On the Web: National Center for Biotechnology Information - PubMed Central - Biophysics of Mitosis (Feb. 06, 2026) (Show more) See all related content
Witness a living plant cell's chromosomes carrying genetic material duplicate during the process of mitosis
Witness a living plant cell's chromosomes carrying genetic material duplicate during the process of mitosisTime-lapse photography of a live plant cell nucleus undergoing mitosis.(more)See all videos for this article

Mitosis is absolutely essential to life because it provides new cells for growth and for replacement of worn-out cells. Mitosis may take minutes or hours, depending upon the kind of cells and species of organisms. It is influenced by time of day, temperature, and chemicals.

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