Biology Class 10 Cell Cycle and Cell Division
Lesson-1 Cell Cycle and Cell Division SYNOPSIS • The sequence of events by which a cell duplicates its genome and synthesises all other cell contents and eventually divides into two daughter cells is called the cell cycle. • Interphase involves a series of changes which take place in a newly formed cell and its nucleus before it gets ready for division again. It is also called intermitosis . It is further divided into ✓First gap or G1 phase: Interval phase between mitosis and the initiation of DNA replication. The cell grows to its maximum size to prepare for DNA replication. ✓ Synthetic or S phase: Synthesis or replication of DNA occurs on the template of the existing DNA strand. The amount of DNA per cell doubles, but there is no change in the chromosome number of the cell. ✓Second gap or G2 phase: Synthesis of RNA and proteins continues. Spindle protein s...