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Cell cycle for moodle

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  • 1. 10-2 Cell Cycle Page 245 Interphase – G 1 - cell grows, normal G 1 Phase functions of life – S Phase – DNA replicatesM Phase – G 2 - cell grows and S Phase prepares for mitosis M Phase – Mitosis – Cell division G 2 Phase
  • 2. ChromosomesIn Interphase, chromosomesappear as chromatinWhen mitosis begins, chromatincondenses to form visiblechromosomesSister chromatids are identicalhalves of a duplicated chromosome • Chromatids are joined at the centromere
  • 3. Mitosis - ProphaseChromosomes condenseNuclear membrane disappearsSpindle fibers form as centrioles move towardpoles
  • 4. Mitosis - Metaphase Chromosomes line up along the cell’s center Chromosomes attach to spindle fibers at the centromeres
  • 5. Mitosis - Anaphase Sister chromatids separate and move toward poles
  • 6. Mitosis – Telophase and Cytokinesis Telophase – last step of mitosis – Individual chromosomes gather at poles – Nuclear membrane reforms Cytokinesis – follows telophase – Cell pinches in half – Two cells form • Animal Cells – cleavage furrow • Plant Cells – cell plate
  • 7. Mitosis in Plant vs. Animal Cells No Centriolescentrioles Spindle FibersPlant Cells Animal Cells Stages of mitosisCell plate Cell (PMAT) pinches at formsbetween cleavage cells furrow
  • 8. Another Look at MitosisMitosis in a Lily Cell Onion Cells Mitosis in Whitefish Cells
  • 9. Mitosis ReviewHow many chromosomes didthis cell start with?– FOURDuring which phase aresister chromatids separated?– ANAPHASEHow many chromosomes arein EACH daughter cell?– FOUR