Genetics - 04 Cell Reproduction

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A closer look at cell reproduction for Year 10 Science students at Saint Ignatius College Geelong.

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Genetics - 04 Cell Reproduction

  1. 1. GENETICS. 04. Cell reproduction. Ian Anderson Saint Ignatius College Geelong
  2. 2. CELL REPRODUCTION.  All cells are derived from pre-existing cells.  Cells must reproduce for  growth of the organism.  repair of damaged cells.  replacement of dying cells.  reproduction of the species.
  3. 3. CELL CYCLE.  The series of event that take place in a cell leading to its division (i.e. interphase + mitosis). Source: http://www.scq.ubc.ca/the-cell-cycle-a-universal-cellular-division-program/
  4. 4. CELL CYCLE.  Interphase.  Cells spend most of their lives in interphase.  Three stages:  G1 (Gap 1)  Cell growing.  S (Synthesis)  DNA replication occurs  chromosomes duplicating.  G2 (Gap 2)  Cell grows & preparation for the next cellular division.  Mitosis.
  5. 5. MITOSIS.  Occurs in eukaryotic organisms.  Single celled eukaryotes e.g. paramecium.  Regions of growth & repair in animals.  Roots & shoot tips of plants (+ other meristemic tissue).  Mitotic cell division is used  To provide new cells for growth.  Repair and maintenance of tissues.  Asexual reproduction.
  6. 6. MITOSIS.  Occurs in somatic cells.  Involves one nuclear division.  Results in two genetically identical daughter cells.  Both daughter cells are diploid (2n).  Four stages (although process is continuous).  Prophase, Metaphase, Anaphase & Telophase.
  7. 7. MITOSIS. Source: Rickard et al. (2006)
  8. 8. MEIOSIS. Source: Rickard et al. (2006)
  9. 9. CELL DIVISION. Head across to http://www.media.pearson.com.au/schools/cw/au_sch_rickard_sd4_1/in t/celldiv.swf?null And complete the mitosis and meiosis interactives.
  10. 10. http://SICkScience10.wikispaces.com/

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