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Cell Reproduction  Prokaryotes Bacteria  Eukaryotes Plants & animals copyright cmassengale.

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Presentation on theme: "Cell Reproduction  Prokaryotes Bacteria  Eukaryotes Plants & animals copyright cmassengale."— Presentation transcript:

1 Cell Reproduction  Prokaryotes Bacteria  Eukaryotes Plants & animals copyright cmassengale

2 Prokaryotes  Lack a nucleus  Have a single chromosome  Reproduce by binary fission  Include bacteria copyright cmassengale

3 Steps in Binary Fission  Used by bacteria  Cells increase their cell mass slightly  DNA & cell components are replicated  Each cell divides into 2 daughter cells copyright cmassengale

4 Binary Fission of Bacterial Cell copyright cmassengale

5 E. Coli Dividing by Binary Fission copyright cmassengale

6 Eukaryotes  Contain a nucleus & membrane bound organelles  Asexually reproduce cells by mitosis copyright cmassengale

7 Cell Cycle  Stages in growth & division  G1 Phase  S Phase  G2 Phase  M Phase  Cytokinesis copyright cmassengale

8 G1 Phase  First growth stage  Cell increases in size  Cell prepares to copy its DNA copyright cmassengale

9 Synthesis Phase  Copying of all of DNA’s instructions  Chromosomes duplicated copyright cmassengale

10 G2 Phase  Time between DNA synthesis & mitosis  Cell continues growing  Needed proteins produced copyright cmassengale

11 M Phase  Cell growth & protein production stop  Cell’s energy used to make 2 daughter cells  Called mitosis or karyokinesis (nuclear division) copyright cmassengale

12 Life Cycle of a Cell Mitosis is a cycle with no beginning or end. copyright cmassengale

13 Interphase – Resting Stage  Cells carrying on normal activities  Chromosomes aren’t visible  Cell metabolism is occurring  Occurs before mitosis copyright cmassengale

14 Interphase

15 Stages of Mitosis  Prophase  Metaphase  Anaphase  Telophase copyright cmassengale

16 Cells Undergoing Mitosis copyright cmassengale

17 Steps in Prophase  DNA coils tightly & becomes visible as chromosomes  Nuclear membrane disappears  Nuceolus disappears  Centrioles migrate to poles  Spindle begins to form copyright cmassengale

18 Prophase

19 Eukaryotic Chromosome copyright cmassengale

20 Human Chromosomes copyright cmassengale

21 Steps in Metaphase  Spindle fibers from centrioles attach to each chromosome  Cell preparing to separate its chromosomes  Cell aligns its chromosomes in the middle of the cell copyright cmassengale

22 Metaphase

23 Steps in Anaphase  Cell chromosomes are separated  Spindle fibers shorten so chromosomes pulled to ends of cell copyright cmassengale

24 Mitotic Spindle copyright cmassengale

25 Anaphase

26 Steps in Telophase  Separation of chromosomes completed  Cell Plate forms (plants)  Cleavage furrow forms(animals)  Nucleus & nucleolus reform  Chromosomes uncoil copyright cmassengale

27 Telophase Plant Animal copyright cmassengale

28 Cytokinesis  Occurs after chromosomes separate  Forms two, identical daughter cells copyright cmassengale

29 Cytokinesis Cell Plate Forming in Plant Cells copyright cmassengale


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