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The Cell Cycle

The Cell Cycle. Section 2.4 BC Science Probe 9 Pages 49-52. The Cell Cycle. The cell cycle is the sequence of events in the cell from one cell division to another. The Cell Cycle. The cell spends most of its time growing and working. This is called interphase . The Cell Cycle.

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The Cell Cycle

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  1. The Cell Cycle Section 2.4 BC Science Probe 9 Pages 49-52

  2. The Cell Cycle • The cell cycle is the sequence of events in the cell from one cell division to another.

  3. The Cell Cycle • The cell spends most of its time growing and working. This is called interphase.

  4. The Cell Cycle • Interphase takes up 90% of the cell cycle.

  5. The Cell Cycle • Interphase is when the cell makes copies of each organelle in the cytoplasm. • Once the cell is large enough, it will also make copies of its chromosomes. • Each chromosome and its copy are known as sister chromatids. • They carry identical instructions.

  6. The Cell Cycle • Interphase and cell division together make up the cell cycle.

  7. Cell Division • In cell division, one cell (the parent cell) divides into two genetically identical cells (the daughter cells).

  8. Cell Division • There are two parts to cell division: • Mitosis • Mitosis divides the nuclear material

  9. Cell Division • There are two parts to cell division: • Cytokinesis • Cytokinesis is the process that divides the cytoplasm and the rest of the organelles in half.

  10. Cell Division • Each daughter cell gets about half of the cytoplasm and organelles and will be about half the size of the parent cell.

  11. The Stages of Mitosis • There are 4 stages of mitosis; • Prophase • Metaphase • Anaphase • Telophase

  12. The Stages of Mitosis #1 – Prophase • The DNA molecules shorten andcondense by coiling, to form chromosomes. The nuclear membrane and nucleolus are no longer visible. • The spindleapparatus (and in animal cells, the centrioles) has migrated to opposite poles of the cell..

  13. The Stages of Mitosis #2 – Metaphase • The spindle fibres attach themselves to the sister chromatids and align the chromosomes halfway between the poles of the cell (down the middle).

  14. The Stages of Mitosis #3 - Anaphase • The spindle fibres shorten and the centromere splits, separated sister chromatids are pulled along behind the centromeres.

  15. The Stages of Mitosis #4 – Telophase • The chromosomes reach the poles of their respective spindles. Nuclear envelope reforms before the chromosomes uncoil. The spindle fibres disintegrate.

  16. Cytokinesis • This is the last stage of cell division. It is the process of splitting the daughter cells apart. A furrow forms and the cell is pinched in two. Each daughter cell contains the same number of chromosomes.

  17. Cytokinesis • It’s a little different in plants: • There’s no furrow/indentation. • Vesicles form between the nuclei, fuse together to form a cell plate which grows out to the membrane and grows a new cell wall.

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