Living Environment

Enzyme Activity:

http://home.earthlink.net/~dayvdanls/enzyme_web_quest.htm

http://www.lewport.wnyric.org/jwanamaker/animations/Enzyme%20activity.html 

Mitosis/Meiosis Lab

Name _______________________________    Block ______________ Date ________________

Due Date ________________________________                                                                                                              

Background:  All cells arise from other cells by cell division.  When cells grow to a certain size they must either divide or die.  Cell division is a complex series of changes in the nucleus of a cell that leads to the production of two new cells.  The new cells are called daughter cells.  The daughter cells grow and increase in size until they divide and produce two more daughter cells.  This process continues, resulting in organism growth and reproduction.

** Note the grading of this lab will involve the neatness and accuracy of drawing and handwriting as well as your science answers.   Trace if you can’t draw and check your spelling.  Use both internet sites and your textbook to assist you in the completion of this activity.

Materials:                              paper                                       pencil/pen

                                                computer w/internet                  textbook

Procedure:

View mitosis/meiosis tutorial from Cornell University  - http://biog-101-104.bio.cornell.edu/BioG101_104/tutorials/cell_division.html

     1.  Construct representative drawings of Interphase and each of the Mitotic phases discussed in class.  Make certain that the centrioles/centrosomes, chromosomes, spindle, etc are   labeled.   Drawings that are not carefully completed will result in a loss of points.

View actual pictures and descriptions of whitefish (animal) mitosis - http://biog-101-104.bio.cornell.edu/BioG101_104/tutorials/cell_division/wf_review_fs.html

View actual pictures and descriptions of onion (plant) mitosis  -  http://biog-101-104.bio.cornell.edu/BioG101_104/tutorials/cell_division/onion_review_fs.html

2.   Create a drawing, which displays the major differences between plant and animal cells at the end of a mitotic division.  Summarize in a paragraph the differences.

3.   Define the following meiosis related terms:  homologous chromosomes, tetrad, and crossing over.

4.   Create a drawing (or more than one drawing) indicating how crossing over occurs in meiosis.  

View lily anther meiosis tutorial from Cornell University  -  http://biog-101-104.bio.cornell.edu/BioG101_104/tutorials/cell_division/lily_review_fs.html

5.   Design a data table, which includes the  major differences between mitosis and meiosis.  At minimum you should come up with three major differences.  Include:  types of cells formed, chromosome number for daughter cells? daughter vs parent chromosomes?  genetic variability?    

Comparison of mitosis and meiosis  -  http://mtsu32.mtsu.edu:11289/cellcycle_web/sld026.htm

Mr. Mills Cells and Cell Processes Page  -  http://www.dbmoz.biz/4/meiosis/meiosis.php?search=mitosis%20and%20meiosis

(contains references to differences between plant and animal cell mitosis and differences between mitosis and meiosis)

6.   Explain the significance of the process of crossing over to living things.  

7.   Practice mitosis and meiosis using the web site below:             

             http://www.biologyinmotion.com/cell_division/