Some of the most specialized cells, such as fully formed nerve cells and muscle cells, do not divide at all in a mature human. These cell cycle differences result from regulation at the molecular level.
https://quizlet.com/13628613/mb-123-flash-cards/
At the G1 checkpoint, cells decide whether or not to proceed with division based on factors such as: 1  Cell size. 2  Nutrients. 3  Growth factors.  DNA damage.
https://www.khanacademy.org/science/biology/cellular-molecular-biology/stem-cells-and-cancer/a/cell-cycle-checkpoints-article
Cells that divide by meiosis to make the egg and the sperm actually divide twice. First, the cell copies the DNA in all 46 chromosomes, and the copies of the same chromosome pair up. One chromosome from each pair moves to each end of the cell. The cell then splits into two: each new cell with 23 chromosomes.
http://www.sciencemuseum.org.uk/WhoAmI/FindOutMore/Yourbody/Whatdoyourcellsdo/Howoftenareyourcellsreplaced/Howdocellsgrowanddivide
Cell cycle checkpoints. A checkpoint is a stage in the eukaryotic cell cycle at which at which the cell examines internal and external cues and decides whether or not to move forward with division. The G1_1​1​​start subscript, 1, end subscript checkpoint, at the G1_1​1​​start subscript, 1, end subscript/S transition.
https://www.khanacademy.org/science/biology/cellular-molecular-biology/stem-cells-and-cancer/a/cell-cycle-checkpoints-article
Cells enter the G0 phase from a cell cycle checkpoint in the G1 phase, such as the restriction point (animal cells) or the start point (yeast). This usually occurs in response to a lack of growth factors or nutrients. During the G0 phase, the cell cycle machinery is dismantled and cyclins and cyclin-dependent kinases disappear. Cells then remain in the G0 phase until there is a reason for them to divide.
https://www.researchgate.net/post/What_is_the_G0_phase_of_the_cell_cycle
In eukaryotes, there are two distinct types of cell division: a vegetative division, whereby each daughter cell is genetically identical to the parent cell (mitosis), and a reproductive cell division, whereby the number of chromosomes in the daughter cells is reduced by half to produce haploid gametes (meiosis).
https://en.wikipedia.org/wiki/Cell_division
Most cells of the human body are actually in the G0 phase. As mentioned earlier, mature nerve cells and muscle cells never divide. Other cell's, such as liver cells, can be called back from the G0 phase to the cell cycle by external cues, such as growth factors released during injury.
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Cell division. Cell division is the process by which a parent cell divides into two or more daughter cells. Cell division usually occurs as part of a larger cell cycle.
https://en.wikipedia.org/wiki/Cell_division
Once it has copied all its DNA, a cell normally divides into two new cells. This process is called mitosis. Each new cell gets a complete copy of all the DNA, bundled up as 46 chromosomes. Cells that are making egg or sperm cells must divide in a different way. Each egg and sperm cell ends up with only half the amount of DNA present in the original cell, bundled up as 23 chromosomes.
http://www.sciencemuseum.org.uk/WhoAmI/FindOutMore/Yourbody/Whatdoyourcellsdo/Howoftenareyourcellsreplaced/Howdocellsgrowanddivide
Many signals registered at checkpoints come from cellular surveillance mechanisms inside the cell. These signals report whether crucial cellular processes that should have occurred by that point have in fact been completed correctly and thus whether or not the cell cycle should proceed.
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explain how cells know whether or not to divide
Once it has copied all its DNA, a cell normally divides into two new cells.