- Cell division
Cell division is the process by which a cell, called the parent cell, divides into two cells, called daughter cells.When the cell divides, everything inside it divides also. The nucleus and the chromosomes divide, and the mitochondria divide also.
In mitosis, an ordinary body cell divides to make two daughter cells.
In meiosis, a cell divides twice, to produce four gametes. The first division of meiosis is a special kind of cell division called a reduction division because the number of chromosomes is halved. The second division of meiosis is similar to mitosis.
Cell division is necessary for following reasons:
- Growth of Organisms
- Maintenance of Chromosome Number
- Maintenance of Nucleo -cytoplasmic Ratio
- Reproduction in Unicellular organisms
- Healing and regeneration
- Genetic variations
- Formation of gamete by meiosis.
- Importance of cell division
MAINLY THREE IMPORTANCE
- In unicellular organism, cell division reproduce an entire organism.
- Cell division can produce the progeny from some multicellular organisms such as those plants which grow from cutting.
- Cell division also enables sexually reproducing organisms to develop from a single cell, the fertilized egg or zygote.
- Cell division involves in repairing of cells.
- It is important because it distributes the identical genetical material to daughter cell.
- With the cell division growth occur through an increase in volume and enlargement of the outer membrane.
- Without cell division death will quickly ensure.