NEET Biology Chapter 10

Cell Cycle and Cell Division

Are you aware that all organisms, even the largest, start their life from a single cell? You may wonder how a single cell then goes to form suck large organisms. growth and reproduction are characteristics of cells, indeed of all living organisms. All cells reproduce by dividing into two, with each parental cell giving rise to two daughter cells each time they divide. These newly formed daughter cells can themselves grow and divide, giving rise to a new cell population that is formed by the growth and division of a single parental cell and its progeny. In other words, such cycles of growth and division allow a single cell to form a structure consisting of millions of cells.

Cell Cycle

Cell division is very important process in all living organisms. During the divisions of a cell, DNA replication and cell growth also take place. All these processes, i.e.... cell division, DNA replication, and cell growth, hence have to take place in a coordinated wat to ensure correct division and formation of progeny cells containing intact genomes. The sequence of events by which a cell duplicates its genome, synthesises the other constituents of the cell and eventually divides into two daughter cells is termed Cell Cycle. Although cell growth is a continuous process. DNA synthesis occurs only during one specific stage in the cell cycle. The replicated chromosomes (DNA) are then distributed to daughter nuclei by a complex series of events during cell division. These events are themselves under genetic control.

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