Biology Week 3: Cells and the Cell Cycle - Day 4,5

The Cell Cycle:

an ordered set of events, culminating in cell growth and division into two daughter cells.

Watson and Crick proposed the double helix model for the DNA molecule in 1953

click to find the answer to today's question What is a gamete?

cell cycle diagram Parts of the cell cycle: link to an Internet Website

G1 phase:

DNA condenses into Chromosomes S phase: G2 phase: Mitosis: link to a local picture link to an Internet Website
The process by which the DNA is divided into two identical sets before the cell divides.
  1. Prophase link to a local picture
    • Early prophase: chromatin coils to form chromosomes, nuclear membrane disappears, and centrioles migrate to opposite poles of the cell.
    • Middle prophase: spindle fibers, microtubules of protein, begin developing.
      • Polar fibers extend across the cell from centriole to centriole.
      • Kinetochore fibers extend from the centromeres of a chromosome to the centrioles.
    • Late prophase: protein fibers called asters radiate from each centriole in animal cells.
  2. Metaphase: link to a local picture
    • Kinetochore fibers move the chromosomes to the equator of the cell.
  3. Anaphase: link to a local picture
    • The centromere of each pair of chromatids divides, the chromatids separate and are pushed to opposite poles of the cell by the combined efforts of the spindle fibers. This movement is done in one quick motion.
  4. Telophase: link to a local picture
    • All spindle fibers disappear, chromatids unwind and stretch to form chromatin, and a nuclear membrane forms around each mass of chromatin.

In any growing tissue, cells will be found in all phases of the cell cycle. link to a local picture

Meiosis occurs only in gametes: gametes are sex cells

It is the process of nuclear division that reduces the number of chromosomes by half.

Day 3,4 Assignment - Cells and the Cell Cycle
Scoring Rubriclink to a local webpage
Word doc version link to a local webpage

PowerPoint is a "presentation graphics" program. It is used to visually provide information to a group of people - not just one person sitting in front of a computer. Color combinations and font size must make the slides easily read from a distance.

  1. Make a PowerPoint presentation that you will use to teach the class about the Cell Cycle, Mitosis and Meiosis. Be prepared to show your power point to the class and teach them about your topic. The requirements below are provided as a minimum standard. Feel free to make a more complex slide show if you wish (higher scores can be earned by adding items like music, animation and video, etc). Your slide show should include the following:

      Slide (1) - Title page including:
      • title of presentation - should catch the audiences attention
      • a picture related to the topic of the presentation
      • also include the following on this slide:
        • your name or names
        • class period
        • date

      Slide (2) - An introduction slide showing an overview of the cell cycle.

      • include some type of graphics on this slide

      Main body Slides (6-10) - Includes information and graphics on the cell cycle process in the correct order.
      (important: do not overload one slide with to much information split it up on different slides).

      Cell Cycle

      • G1
      • S (replication)
      • G2
      • M, parts of mitosis (P.M.A.T.)
      • Cytokinesis

      Main body slide (2-5)


      • How is it different then mitosis
      • What is the purpose
      • Meiosis I & II
      • Only occurs in certain types of cells

      Concluding slide(s) - Restates the overall importance and process of the cells cycle.

      Work cited slide - Site all sources used to make presentation (must have at least two sources)


      Honors biology: the following option is required

      Extra credit can be earned by setting your power point to run on its own once started allowing you to read (and the audience) your presentation without long pauses or going to fast. *Warning* practice makes perfect: Setting the timing and slide transitions may run different on computers with different windows versions such as window 2000 and windows xp (always save the power point in windows 2000 version as that is what our school currently runs).

      Important: Use scoring rubric to self evaluate power point.

      Presentation day:

      • Presentation saved to disk and server file for access in the classroom (always have a backup).
      • Bring a hard copy of presentation (6 slides to a page format) and rubric stapled together with rubric on top.

      Student Examples: These are a few examples from past students.

      Student example 1link to a local webpage

      Student example 2link to a local webpage

Research Links:

Biology Class Cell Page










Gametes are sex cells, sperm and egg.