Mitotic Cell Cylce
- Interphase: Period between division
- Mitosis:
- Cell divides
Longest phase in cell cycle = 90% of a cells life is in interphase
DNA been copied.
o The total DNA content goes from 2n to 4n
Cell organelles been copied
o .This is to ensure that each of the two new cells receives copies of all the organelles (so it can function).
Mitosis is division of the nucleus to produce two daughter nuclei containing identical sets of chromosomes.
Stage 1: Prophase
Stage 2: Metaphase
Stage 3: Anaphase
Stage 4: Telophase
Stage 1: Prophase
![Picture](/uploads/2/6/9/0/26900109/_____78515.png)
• Each chromosome appears as a duplicated strand: Sister chromotids.
• Centrioles migrate to each end of the cell and fibres appear in cytoplasm
• Nuclear membrane starts to break down.
• Centrioles migrate to each end of the cell and fibres appear in cytoplasm
• Nuclear membrane starts to break down.
Stage 2: Metaphase
![Picture](/uploads/2/6/9/0/26900109/_____2521993.png)
• Chromosomes thicken even more
• Chromosomes line up across the centre of cell
• Fibres attach to chromosomes at centromers (Each sister chromotid has 2 fibres attached, 1 from each side of the cell)
• Chromosomes line up across the centre of cell
• Fibres attach to chromosomes at centromers (Each sister chromotid has 2 fibres attached, 1 from each side of the cell)
Stage 3: Anaphase
![Picture](/uploads/2/6/9/0/26900109/_____7499577.png)
• Fibres contract, sister chromatids are pulled apart
• Each daughter chromosome is pulled to opposite end of cell.
• Hence, identical set of genes pulled to each end of the cell.
• Each daughter chromosome is pulled to opposite end of cell.
• Hence, identical set of genes pulled to each end of the cell.
Stage 4: Telophase
![Picture](/uploads/2/6/9/0/26900109/_____4963168.png)
• Nuclear membrane forms around each of the 2 sets of chromosomes
• Chromosomes elongate within each nucleus to chromatim
Mitosis is complete
• Chromosomes elongate within each nucleus to chromatim
Mitosis is complete