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Mitosis

Mitosis. http://www.youtube.com/watch?v=AhgRhXl7w_g&feature=fvst. Types of Reproduction. Asexual- Involves a single cell dividing into two identical daughter cells Examples Mitosis Binary Fission Sexual

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Mitosis

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  1. Mitosis

  2. http://www.youtube.com/watch?v=AhgRhXl7w_g&feature=fvst

  3. Types of Reproduction • Asexual- • Involves a single cell dividing into two identical daughter cells • Examples • Mitosis • Binary Fission • Sexual • Involves two cells (sperm and egg) joining to make a new cell (zygote)that is not identical to the parents • Examples • Meiosis

  4. Prokaryotic Cell Undergoing Binary Fission

  5. Eukaryotic Cell Division • Used for growth and repair • Produce two new cells identical to the original cell • Cells are diploid (2n) Chromosomes during Metaphase of mitosis Cytokinesis Anaphase Prophase Metaphase Telophase

  6. Identical Daughter Cells Two identical daughter cells Parent Cell

  7. The Cell Cycle • G1 - primary growth phase • S – synthesis; DNA replicated • G2 - secondary growth phase collectively these 3 stages are called interphase • M - mitosis • C - cytokinesis

  8. The Cell Cycle DNA Copied Cells prepare for Division Cells Mature Daughter Cells Cell Divides into Identical cells

  9. Mitosis • Only occurs in eukaryotes • The nucleus divides • Includes 4 stages • Prophase • Metaphase • Anaphase • Telophase

  10. Review of Prophase What the cell looks like What’s happening

  11. Spindle Attachment

  12. Review of Metaphase What the cell looks like What’s occurring

  13. Anaphase Review What the cell looks like What’s occurring

  14. Comparison of Anaphase & Telophase

  15. Cytokinesis • Means division of the cytoplasm • Division of cell into two, identical halves called daughter cells • In plant cells, cell plate forms at the equator to divide cell • In animal cells, cleavage furrow forms to split cell

  16. Cytokinesis Cleavage furrow in animal cell Cell plate in animal cell

  17. Daughter Cells of Mitosis • Have the same number of chromosomes as each other and as the parent cell from which they were formed • Identical to each other, but smaller than parent cell • Must grow in size to become mature cells (G1 of Interphase)

  18. Uncontrolled Mitosis • If mitosis is not controlled, unlimited cell division occurs causing cancerous tumors • Oncogenes are special proteins that increase the chance that a normal cell develops into a tumor cell Cancer cells

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