Metaphase
Metaphase
Metaphase (pronounced: meh-tuh-feyz) is a stage in mitosis and meiosis, two processes of cell division.
Etymology
The term "metaphase" comes from the Greek words "meta," meaning "after," and "phase," meaning "stage." It was first used in this context in the late 19th century.
Definition
Metaphase is the third stage of cell division, following prophase and preceding anaphase. During metaphase, the chromosomes align in the middle of the cell, at a point known as the metaphase plate. This alignment is facilitated by the spindle apparatus, a structure composed of microtubules that guides the movement of chromosomes.
Related Terms
- Mitosis: The process of cell division in which one cell divides into two identical daughter cells.
- Meiosis: A type of cell division that results in four daughter cells, each with half the number of chromosomes of the parent cell.
- Prophase: The first stage of cell division, during which the chromosomes condense and the spindle apparatus begins to form.
- Anaphase: The stage of cell division following metaphase, during which the chromosomes are pulled apart to opposite ends of the cell.
- Spindle apparatus: A structure composed of microtubules that guides the movement of chromosomes during cell division.
- Chromosome: A structure composed of DNA and proteins that carries the genetic information of an organism.
- Metaphase plate: The imaginary line in the middle of the cell where chromosomes align during metaphase.
External links
- Medical encyclopedia article on Metaphase
- Wikipedia's article - Metaphase
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