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What are we learning today?

Explore the phases of mitosis, including cell division, cell cycle, and the significance of mitosis in asexual reproduction. Learn how cells divide and produce new cells, and understand the importance of genetic continuity.

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What are we learning today?

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  1. What are we learning today? • What are the phases of mitosis and what happens during each phase? • What is the significance of mitosis to asexual reproduction?

  2. Mitosis Cell division

  3. Cell Cycle • Cell division: process by which cells divide to produce new cells. • The two cells are identical to the original cell.(parent cell) • The new cells are called daughter cells Liver Cells

  4. As an organism grows and changes, new cells are being produced as old ones are dying. CellLifespan

  5. As an organism grows and changes, new cells are being produced as old ones are dying. CellLifespan

  6. As an organism grows and changes, new cells are being produced as old ones are dying. CellLifespan

  7. As an organism grows and changes, new cells are being produced as old ones are dying. CellLifespan

  8. As an organism grows and changes, new cells are being produced as old ones are dying. CellLifespan

  9. As an organism grows and changes, new cells are being produced as old ones are dying. CellLifespan

  10. As an organism grows and changes, new cells are being produced as old ones are dying. CellLifespan

  11. As an organism grows and changes, new cells are being produced as old ones are dying. CellLifespan

  12. Cell Cycle • Cells undergo a period of growth and a period of division. • The majority of the cell’s life is spent in Interphase • During interphase, a cell grows in size, and carries on metabolism

  13. Cell cycle • During interphase, the DNA is in the form of chromatin. • Chromatin is long stringy strands of DNA. • The long strands allow the DNA to be read • The DNA is replicated during interphase (copied)

  14. Mitosis • Mitosis: a period of nuclear cell division. • Two daughter cells are formed each with a complete set of chromosomes.

  15. Chromosomes • Chromosomes: long, tightly coiled strands of DNA • Carry genetic information which is passed from parent to daughter cell

  16. Chromosomes • After being replicated, the chromosome is made of 2 sisterchromatids held together by a centromere.

  17. Prophase • Prophase: first and longest phase of mitosis • Chromatin coils into visible chromosomes • The nuclear envelope disintegrates.

  18. Prophase • Centrioles move to opposite sides of the cell • Spindlefiber forms between them.

  19. Prophase • Name the parts of the cell in prophase • Chromosome • Centriole • Spindle fiber • Nuclear membrane

  20. Metaphase • Metaphase: 2nd phase. • Mitotic spindle is completely formed, connecting the centrioles. • Chromosomes attach to the spindle. • Chromosomes lineup along the middle.

  21. Anaphase • Anaphase: 3rd Phase • The two centromeres of the chromosome split apart • Chromatid pairs separate and are pulled to the opposite sides.

  22. Telophase • Telophase: 4th Phase • Chromatids reach the opposite sides. • Spindle fibers break down. • Nuclear envelope forms • Chromosomes unravel

  23. Cytokinesis • Cytokinesis: separation of cytoplasm after telophase • New cell membrane forms • Two daughter cells formed.

  24. Name the phase. • Metaphase

  25. How do you know? • Metaphase

  26. Does anything else happen during this phase? • Metaphase

  27. Name the phase. • Prophase

  28. How do you know? • Prophase

  29. Does anything else happen during this phase? • Prophase

  30. Name the phase. • Telophase

  31. How do you know? • Telophase

  32. Does anything else happen during this phase? • Telophase

  33. Name the Phase. • Anaphase

  34. How do you know? • Anaphase

  35. Does anything else happen during this phase? • Anaphase

  36. Results of Mitosis • Genetic continuity – two cells which are identical to the parent cell • Cells that are alike can work together to perform a specific task. • CellTissueOrganOrgan system • No matter how complex the system, the cell is the basic unit of life

  37. What order? • How can I remember what order they go in? • PMAT • Prophase, Metaphase, Anaphase, Telophase…

  38. What are we learning today? • What are the phases of mitosis and what happens during each phase? • What is the significance of mitosis to asexual reproduction?

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