Explain the cell cycle

The cell cycle is divided into interphase and mitotic phase (and cytokinesis). Interphase occupies most of the cell cycle (90% in mammals) and can be referred to as the 'resting phase' as no division takes place. Interphase itself is dived into G1 (growth phase 1) when proteins making up cell organelles are synthesised , S (synthesis) when DNA is replicated by semi conservative replication and G2 (growth phase 2) when the organelles grow and energy stores are increased.The mitotic phase is when the nucleus divides to produces two identical daughter nuclei with the same number of chromosomes as the parent cell. It is split into prophase (when the chromatin condenses, chromosomes become visible and nuclear envelope disintegrates), metaphase (when chromosomes line up along the metaphase plate), anaphase (when chromosomes break at centromeres and sister chromatids move to opposite ends of the cell) and telophase (when the nuclear membrane reforms and chromosomes becomes long and thing again). Cytokinesis occurs next. During this, the cytoplasm between the two nuclei splits into two and two genetically identical cells are created. Depending on signals to the cell, these can go on to do the cell cycle again or go into G0 phase, when the cell is neither dividing nor preparing to divide.