1 / 13

The cell cycle and mitosis

The cell cycle and mitosis. Cells constantly reproduce exact duplicates of themselves. Why? Replacement Repair Growth. Cells must make an exact copy of their DNA DNA is the blueprint of the cell and is found in the nucleus.

lenora
Télécharger la présentation

The cell cycle and mitosis

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. The cell cycle and mitosis

  2. Cells constantly reproduce exact duplicates of themselves. Why? • Replacement • Repair • Growth

  3. Cells must make an exact copy of their DNA • DNA is the blueprint of the cell and is found in the nucleus

  4. Cell growth and division happens in a series of recognizable steps called the Cell Cycle • Rephrase: what is the cell cycle?

  5. Cell cycle has three phases • 1. Interphase • Cell growth • DNA replication occurs • 2. Mitosis • Nuclear division • 2 daughter cells formed, each has identical DNA • 3. Cytokinesis • 2 identical cells

  6. DNA forms chromosomes- • For most of the cell’s life, DNA is arranged “loosely” in the form of chromatin • During mitosis DNA condenses into chromosomes

  7. Interphase • Longest phase • Cell grows • Chromosomes are duplicated- each duplicate is called a sister chromatid

  8. Prophase • Nuclear envelope breaks down • Sister chromatids joined at centromere • Centrioles move to opposite ends and the spindle fibers form between them

  9. Metaphase • Short • Spindle fibers attach to centromere • Sister chromatids line up along midline

  10. Anaphase • Sister chromatids are pulled apart by the spindle fibers

  11. Telophase • Final phase of mitosis- opposite of prophase • Chromatids reach opposite poles • Nuclear envelope reforms • Chromosomes unwind

  12. Cytokinesis • Cytoplasm division • Cytokinesis differs between plants and animals- why?

More Related