AQA AS Biology Cell Cycle

AQA AS Biology Cell Cycle

1. 1. Interphase

   • G1
     • New cell grows and carries out normal functions
   • S Phase
     • The cell's DNA is replicated - each chromosome becomes double stranded
   • G2
     • The second growth phase

2. 2. Prophase

   • Nuclear envelope and nucleus disappears
   • Chromosomes condense and become visible under a microscope

3. 3. Metaphase

   • Spindle fibres form
   • Chromosomes line up at the cell equator

4. 4. Anaphase

   • Spindle fibres attach to the centromere of the chromosomes
   • Sister chromatids are pulled to opposite poles of the cell

5. 5. Telophase

   • Cytokinesis begins
   • Nucleolus and nuclear envelope reforms
   • Chromosomes become invisible under a microscope

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