This is a document of my own Quizlet flashcards from my Biology A level revision. It includes the majority of important terms from the topic. There are 17 terms and definitions on the topic. If you would prefer to cut up the definitions and stick them onto flashcards I can attach a different format...
Unit 2 - Development, Plants and the Environment
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cell cycle and mitosis
Study online at https://quizlet.com/_9d5gtr
1. cell cycle - takes place in dividing body cells
- cell cycle doubles the number of cells without changing
genetic information
- cell cycle produces new cells for growth in multicellular
organisms, asexual reproduction and wound healing
- non embryonic eukaryotic cells divide when triggered to
enter the cell cycle
- 3 main stages: interphase, mitosis and cytokinesis (cell
division)
2. cell cycle dia-
gram
3. G0 phase - most non-dividing cells (e.g. brain cells) go to this phase
4. G1 phase - growth of the cytoplasm and organelles
5. S phase - synthesis of DNA
6. G2 phase - second growth phase
7. mitosis - process of nuclear division where two genetically identi-
cal nuclei are formed from one parent cell nucleus
- stages of mitosis: Prophase, Metaphase, Anaphase,
Telophase (PMAT)
8. prophase - chromosomes have already replicated during interphase
- chromosomes shorten and thicken (supercoil)
- nuclear envelope breaks down
- centriole divides and each daughter centriole moves to
opposite poles of the cell to form spindle
9. metaphase - the chromosomes move to the central region of the
spindle (the equator)
- they attach to the spindle at the centromere
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