1 / 10

2.3: The Cell Cycle

2.3: The Cell Cycle. 200 trillion cells in your body Millions dividing Others doing designated jobs Genetic material (DNA) stored in nucleus When cell divides DNA condenses  Chromosomes Contain hundreds of genes Humans - 46 chromosomes. 2.3: The Cell Cycle. DNA Replication

gracie
Download Presentation

2.3: The Cell Cycle

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. 2.3: The Cell Cycle • 200 trillion cells in your body • Millions dividing • Others doing designated jobs • Genetic material (DNA) stored in nucleus • When cell divides DNA condenses Chromosomes • Contain hundreds of genes • Humans - 46 chromosomes

  2. 2.3: The Cell Cycle • DNA Replication • Cell makes copy of DNA before dividing • produces 2 identical DNA strands • Called chromatids • Held together by centromere • Interphase – most common cell phase • 90% of time • When cell does its job (not dividing)

  3. 2.2: The Cell Cycle • Cell cycle • Consists of several phases • Birth of a cell  reproduction of new cell • Cells divide at different rates

  4. 2.3: Mitosis – Cell Division • DNA duplicated (interphase)  must be divided between 2 daughter cells • Movement of chromosomes during Mitosis involves: • Centrioles • act like poles guiding cell division • Spindle fibers • help move chromosomes

  5. 2.3: Mitosis = 4 Steps (PMAT) • Prophase • DNA condenses into chromosomes • Nuclear envelope disappears • Chromosomes connect to spindle fibers

  6. 2.3: Mitosis = 4 Steps (PMAT) • Metaphase • Chromosomes line up in center of cell • Attached to spindle fibers

  7. 2.3: Mitosis = 4 Steps (PMAT) • Anaphase • Sister chromatids separate from their partners to opposite sides of cell • Spindle fibers shorten

  8. 2.3: Mitosis = 4 Steps (PMAT) • Telophase • 2 new Nuclei form (cells divide into 2) • Chromosomes uncoil • Mitosis ends

  9. 2.3: Cytokinesis • Cytokinesis • Splitting of the cytoplasm • Animal cells – pinches in to form 2 daughter cells • Plant cells – cell plate forms in middle

More Related