Flashcards
Mitosis
Cards in this deck (12)
- 1What is mitosis?The process of cell division in eukaryotic cells.
- 2Why is mitosis important?Ensures 2 daughter cells are identical to parent cell.
- 3How do prokaryotic cells reproduce?Binary fission
- 4What happens before mitosis?- DNA replicated and converted into 2 identical molecules called chromatids
- Chromatids joined at centromere - 5What is chromatin?- DNA and histones (proteins)
- Dense complex - 6What are the 4 stages of mitosis?- Prophase
- Metaphase
- Anaphase
- Telophase - 7What happens during prophase?1. Chromatin fibres coil and condense to form chromosomes, nucleolus disappears and nuclear membrane breaks down
2. Protein microtubules form spindles linking the poles of the cell.
3. 2 centrioles migrate to opposite poles
4. Spindle fibres attach to centromeres and move chromosomes
5. Nuclear envelope disappeared - 8What happens during metaphase?Chromosomes moved by spindle fibres to form a plane in the centre of the cell
- 9What happens during Anaphase?- Centromeres divide
-Chromatids pulled to separate poles of cell by shortening spindle fibres - 10What happens during Telophase?- Chromatids reach poles
- Sets assemble at each pole
- Nuclear envelope reforms
- Chromosomes uncoil and nucleolus reformed
- Cytokinesis begins - 11How does cytokinesis happen in animal cells?- Cleavage forms around middle of cell
- Cell-surface membrane pulled inwards by cytoskeleton until it fuses around the middle - 12How does cytokinesis happen in plant cells?-Vesicles from Golgi apparatus begin to assemble in same place as metaphase plate
- Vesicles fuse, dividing cell
- New cell wall forms
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- AS level Biology (Chapter 06 - Cell division) Flashcards on Mitosis, created by Bethany Westwood on 13/01/2017.
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- Bethany Westwood
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