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Chapter 4 Section 1 Cell Division and Mitosis - PowerPoint PPT Presentation


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Chapter 4 Section 1 Cell Division and Mitosis. “life cycle” of a cell series of events that takes place from one cell division to the next no set time for cycle- ranges from minutes to days

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Chapter 4 Section 1

Cell Division and Mitosis


  • “life cycle” of a cell

  • series of events that takes place from one cell division to the next

  • no set time for cycle- ranges from minutes to days

  • not only used to make an organism, but also to replace parts in an organism such as skin, bone, blood, etc.

1. The Cell Cycle


2. Interphase

  • period of growth and development of most eukaryotic cells (cells with a nucleus)

  • some cells, such as nerve cells and some muscle cells are always in this phase


3. Mitosis


4. Chromosome nuclei

- structure in the nucleus that contains hereditary material

5. Chromatid

  • A single strand of DNA in the nucleus of a cell

  • 2 chromatids coiled together form a chromosome


Steps to Mitosis: nuclei

6. Prophase

  • pair of chromosomes are fully visible

  • nucleolus and nuclear membrane disintegrate

  • centrioles move to opposite ends of cells

  • spindle fibers begin to spread across cell

*** Plant cells do not have centrioles.***


7. Metaphase


9. nucleiTelophase

  • spindle fibers disappear

  • chromatids uncoil

  • new nucleus forms

  • animal cells- cell splits down the middle

  • plants cells- cell plate forms


  • Remember: nuclei

  • It is the division of the nucleus

  • produces 2 new nuclei that are identical to each other and the original cell

  • every cell in your body, except sex cells, have 46 chromosomes

  • all of these cells have the same set of genetic material (skin, hair, blood, liver cells all have the same nucleus and the same 46 chromosomes)

10. Results of Mitosis:


1. Asexual Reproduction

  • process bacteria uses to reproduce

  • bacteria contains no nucleus so it cannot divide by mitosis

  • copies the genetic material and then the cell splits

2. Fission


3. Budding

  • Process that uses cell division to regrow body parts

  • sponges, planaria, and sea stars can also use this for asexual reproduction

4. regeneration


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