1 / 22

Cells divide during the mitotic phase

Cells divide during the mitotic phase. Section 9.3. Parts of the Mitotic Phase. Introduction to Mitosis. Interphase. Cell prepares for division by: replicating DNA and organelles increasing cell size. Interphase Cont. G1 (Gap) Phase: * Growth-the cell grows in size.

lloeb
Download Presentation

Cells divide during the mitotic phase

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Cells divide during the mitotic phase Section 9.3

  2. Parts of the Mitotic Phase

  3. Introduction to Mitosis

  4. Interphase • Cell prepares for division by: • replicating DNA and organelles • increasing cell size

  5. Interphase Cont. • G1 (Gap) Phase: * Growth-the cell grows in size. • S (Synthesis) Phase of Cell Cycle:* The cell duplicates its chromosomes and cellular contents.* The chromosomes are in the form of chromatin (long and stringy material) • G2 (Gap) Phase of the Cell Cycle:* The cell prepares the enzymes and machinery for mitosis.

  6. Stages of Mitosis

  7. Prophase •  Cell prepares for nuclear division by: • condensing DNA into movable packages called chromosomes • DNA wrapped around histone proteins Early Prophase Late Prophase

  8. Prophase Cont. Early Prophase • During early prophase, the chromosomes condense, making them distinguishable when using a light microscope. • The nuclear envelope disperses. Late Prophase • During late prophase, the nucleoli disappear and the mitotic spindle apparatus assembles. • The mitotic spindle will consist of microtubules that extend from pole to pole.

  9. Metaphase • Cell prepares chromosomes for division by: • aligning chromosomes at cell equator • attaching spindle fibers from each new daughter cell pole to each chromosome at the centromere

  10. Chromosomes divide: spindle fibers pull chromosomes apart one-half of each chromosome (chromatid) moves to a new daughter cell Anaphase Early Anaphase Late Anaphase

  11. Cytoplasm divides: DNA decondenses and two nuclei form new cell wall (cell plate) appears between the two nuclei to form two new daughter cells The process of cytokinesis, where the cytoplasm is divided by cleavage, also starts sometime in late anaphase and continues through telophase Telophase

  12. The final steps are : completion of the total formation of a membrane between each of the new daughter cells to yield two identical but separate new cells. Daughter Cells

  13. SignificanceofMitosis • Mitosis results in exactly identical chromosomes in each daughter cell. • The number of chromosomes stays the same following mitosis: • a diploid cell produces diploid cells • a haploid cell produces haploid cells

  14. Mitosis Quiz

  15. Concept Check 9.3 • Describe a significant event that occurs in each of the four stages of mitosis. • Compare and contrast cytokinesis in animal and plant cells. • In what sense may prophase and telophase in mitosis be characterized as opposites?

  16. Lets See the Whole Process

  17. Lets see Real Cells Divide • http://iknow.net/cell_div_education.html

More Related