Cell is cleaved into two new daughter cells

Cell Cycle &Mitosis

Cell Cycle and Mitosis Webquest Name ____________________________________ Eukaryotic Cell Division: There are several reasons for the cell to divide. Two reasons are shown at the following website: http://plaza.ufl.edu/alallen/pgl/modules/rio/stingarees/module/what.html 1. Name the two reasons shown for cell division.

 ________________________________________________________________ *_________________________________________________________________ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ There are several parts of the cell involved in cell division. Click on the parts shown at the following site and read what they do. http://plaza.ufl.edu/alallen/pgl/modules/rio/stingarees/module/index.html 2. List the four organelles involved in cell division and what they do.

 __________________________- ________________________________________________________ *__________________________ - ________________________________________________________

 __________________________ - ________________________________________________________ *__________________________ - ________________________________________________________

DNA can take many forms. When the cell is resting, it takes the form of chromatin. Look at chromatin in the following site: http://www.cgl.ucsf.edu/chimera/ImageGallery/entries/large_images/chromatin3-large.png 3. Describe the appearance of chromatin? ___________________________________________ ______________________________________________________________________________

When the cell needs to divide, the DNA must coil up tightly into chromosomes. When DNA has not copied itself, the chromosomes will only have one strand. These strands are called chromatids. After DNA replicates, each strand (chromatid) has a twin that is attached to it. These pairs of twin chromatids are called sister chromatids. Sister chromatids are connected by a centromere. See what chromatids and sister chromatids look like on the following site: http://library.thinkquest.org/28751/review/division/1.html 4. Draw and label a picture of the sister chromatids and the centromere.

http://plaza.ufl.edu/alallen/pgl/modules/rio/stingarees/module/what.html
http://plaza.ufl.edu/alallen/pgl/modules/rio/stingarees/module/index.html
http://www.cgl.ucsf.edu/chimera/ImageGallery/entries/large_images/chromatin3-large.png
http://library.thinkquest.org/28751/review/division/1.html
Stages of Mitosis: Go to the following website: http://www.cellsalive.com/mitosis.htm **On the left side of the screen is a navigation bar, click on the link to “MITOSIS”. View the animation and read the text below the animation on this page. 9. List the stages of mitosis (Notice – there’s an extra phase here…”prometaphase” – sometimes that is added as an “in-between” phase between prophase and metaphase. In my class you are only responsible for knowing PMAT)

 __________________________ *__________________________

 __________________________ *__________________________ 10. In which stage does each of the following occur: Chromatin condenses into chromosomes – ____________________________ Chromosomes align in center of cell. – ____________________________ Longest part of the cell cycle. – ____________________________ Nuclear envelope breaks down– ____________________________ Cell is cleaved into two new daughter cells. – ____________________________ Daughter chromosomes arrive at the poles. – ____________________________ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 11. Identify the stages of mitosis in these cells:

____________ _______________ _______________ _______________

Onion Root Tip - Online Lab Activity: http://www.biology.arizona.edu/cell_bio/activities/cell_cycle/cell_cycle.html *Read the introduction, then click the “next” button. *Check out the different phases & read them & hit “next”. *Read the “assignment” then hit “next” *You will have 36 cells to classify. When you're finished, record your data in the chart below.

Interphase Prophase Metaphase Anaphase Telophase Total

Number of cells 36

Percent of cells 100%

(calculate percentage: number of cells divided by total cells x 100 ) 12. What do you notice about the stages from your calculations in the table? _____________________________________________________________________________________ _____________________________________________________________________________________ 13. What did you notice about the difference between Interphase & Prophase? ____________________________________________________________________________________ ____________________________________________________________________________________

http://www.cellsalive.com/mitosis.htm
http://www.biology.arizona.edu/cell_bio/activities/cell_cycle/cell_cycle.html