Summary
The ordered sequence of growth, DNA replication and division: G1, S, G2 and the mitotic phase.
In depth
Interphase comprises G1 (growth), S (DNA synthesis) and G2 (preparation); then M phase includes mitosis and cytokinesis. Cells that stop dividing enter G0, as neurons do. A typical human cell cycle lasts about 24 hours, with most of it spent in interphase.
After S phase each chromosome consists of two sister chromatids joined at a centromere. The cycle is regulated internally and by external signals such as growth factors.
Remember: DNA content doubles during S phase and returns to normal after cell division.
Frequently asked questions
What is Cell Cycle?
The ordered sequence of growth, DNA replication and division: G1, S, G2 and the mitotic phase.
Which area of biology covers Cell Cycle, and how advanced is it?
Cell Cycle is one of the 52 topics in Cell Biology. It is rated Intermediate, so it suits learners who already know the core vocabulary. Related topics in this area include Telomeres and Senescence, Mitosis, Meiosis.
What should I learn before Cell Cycle?
Work through the Beginner topics in Cell Biology first, such as Cell Theory, Prokaryotic Cell, Eukaryotic Cell, then return to Cell Cycle. Intermediate topics assume the Beginner vocabulary.
What topics are related to Cell Cycle?
The closest topics to Cell Cycle are Telomeres and Senescence, Mitosis, Meiosis, Cytokinesis. Comparing them side by side is a good way to see how the ideas connect.
How can I check that I understand Cell Cycle?
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Cell Cycle. To practise the whole of Cell Biology, use the Cell Biology quiz.
How is Cell Cycle different from Telomeres and Senescence?
Cell Cycle: The ordered sequence of growth, DNA replication and division: G1, S, G2 and the mitotic phase. Telomeres and Senescence: Shortening of chromosome end caps with each division eventually triggers permanent growth arrest called senescence. Read both side by side and note what each one explains.
How should I study Cell Cycle step by step?
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with Telomeres and Senescence and explain the difference aloud. Finally, take the Cell Biology quiz and come back to this page for any question you miss.