1 / 16

Mitosis, Significance to unicellular and multicellular organisms, Chromosomes

Mitosis, Significance to unicellular and multicellular organisms, Chromosomes. Significance of cell reproduction to multicellular & unicellular organisms. 1. Unicellular: reproduce by cell division. Also called binary fission.

joanne
Download Presentation

Mitosis, Significance to unicellular and multicellular organisms, Chromosomes

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. Mitosis, Significance to unicellular and multicellular organisms, Chromosomes

  2. Significance of cell reproduction to multicellular & unicellular organisms 1. Unicellular: reproduce by cell division. Also called binary fission.

  3. 2. Multicellular- processes of growth and repair upon cell division, also the production of sex cells.

  4. Describe chromosomes 1. Carriers of genetic material found in nucleus 2. Made up of DNA 3. Information is copied and passed to future generations

  5. 4. Usually exist as chromatin a. long, winding strands which condense into chromosomes before dividing 5. Human chromosome number is 46 in body cells, 23 in sex cells

  6. The Cell Cycle 1. The cell cycle is a sequence of growth and division of a cell Made up of 2 distinct stages: A. Interphase: growth period where DNA is copied B. Mitosis: dividing period producing 2 new cells

  7. Interphase 7 Hours DNA synthesis 11 Hours Rapid growth, centrioles replicate 3 Hours Growth & final prep P M T A Mitosis-1 hour

  8. Interphase- the first part of the cell cycle • Also called the resting stage • Cells make ATP • The cell repair themselves • Make proteins • Make new organelles • Copying new chromosomes(DNA)

  9. Mitosis is the division of the cytoplasm followed by cell division. There are 4 stages of mitosis. Mitosis

  10. Prophase • The following events occur: • Chromatin coils to form short rods • The 2 copies (chromatids) join to form chromosomes- held together by centromere • Nuclear membrane disappears

  11. 4. Centrioles move to opposite ends of the cell 5. Spindle forms-helps pull chromosomes apart & are attached to centrioles centrioles

  12. Metaphase • Chromosomes attach to spindle fibers • Chromosomes line up in the middle of the cell(equator).

  13. Anaphase • Centromeres split apart • Chromatids pairs split apart and begin to move to opposite ends(poles).

  14. Telophase • Chromatids reach opposite poles. • Chromatids begin uncoiling to form chromatin again • Spindle breaks down • Nucleolus and nuclear membrane reappear • Plasma membrane begins to pinch in

  15. Division of Cytoplasm-cytokinesis In plants- the cell plate forms down the equator of the cell In animals-the cell pinches in along the equator

More Related