Homework from last class:Homework from last class:Complete the Mitosis, Stages of the Cell

Cycle, and The Cell Cycle worksheets from the handout

Study for Quiz on Ch. 5.1 – The Cell Cycle and Mitosis (pp. 150-157)

Inform me of your Mitotic Movies groupBring field trip forms and $Read over class notes and check out the

class blog: http://msoonscience.blogspot.com/

Ch. 5.1 QuizCh. 5.1 QuizYou have ~7 minutes to write the quiz.

Good luck!

Cytokinesis, Cytokinesis, Checkpoints in the Cell Checkpoints in the Cell Cycle, and CancerCycle, and CancerChapter 5.1 pp. 158-161

CytokinesisCytokinesiscytokinesis: the final stage of the cell cycle; separates the 2 nuclei and cell contents into 2 daughter cells. New cells are identical to the parent cell.

Parent cell (in telophase)

2 identical daughter cells

Animal cells – cell membrane pinches together to divide the cell’s cytoplasm and organelles

Plant cells – a cell plate forms along the centre of the cell to divide the cell into 2 daughter cells

Checkpoints in the Cell Checkpoints in the Cell CycleCycleActivities in the cell cycle are monitored and controlled at specific stages (checkpoints).

Proteins at these checkpoints monitor cell activities send info to nucleus instructs the cell whether or not to divide

Cells will not divide if: Not enough nutrients to support cell growth DNA in nucleus has not been replicated DNA is damaged

Checkpoints in the Cell Checkpoints in the Cell CycleCycle

p. 159

Control of the Cell CycleControl of the Cell Cyclehttp://nobelprize.org/educational/medicine/2001/cellcycle.html

Activity time!Group 1: Onion Root Lab

Activity

Group 2: Cancer Investigation

Activity Instructions:Activity Instructions:I will divide you into 2 groups.

Group 1 will begin with the Onion Root Lab activity at the back of the class.

Group 2 will begin with the Cancer Investigation at the front of the class.

After 20 minutes, the groups will switch activities.

Complete your worksheets at each station.

CancerCancerCheckpoints in the cell cycle can stop the

cell from growing and dividing.

Mutagens (ex. viruses, X rays, UV light, chemicals) can cause mutations in a cell and harm the organism.

If a mutation occurs in a gene producing the instructions for a checkpoint protein, cell cycle control will be lost can lead to uncontrolled division (cancer)

Healthy cells stop dividing when they receive messages from neighbouring cells; cancer cells do not respond to messages from nearby cells continue to divide tumour

p. 161

Cancer cells are not specialized, but release chemicals to attract small nearby blood vessels branch into the tumour to deliver nutrients feed tumour tumour growth

Cancer can spread to other parts of the body if some tumour cells break away carried by the blood vessels to a new location can form another tumour

Cancer cells have large, abnormal nuclei because cell division checkpoints no longer function chromosomes do not divide correctly

Cancer AnimationsCancer Animationshttp://science.education.nih.gov/supplements/nih1/cancer/activities/activity2_animations.htm

Homework for next class:Homework for next class:Complete the Onion Root Lab Activity

and The Cell Cycle and Cancer worksheetRead notes on Cancer on the class blog

(in this slideshow)Keep working on your Mitotic Movies

projectBring field trip forms and $ ASAPRead over class notes and check out the

class blog: http://msoonscience.blogspot.com/

Works CitedWorks CitedImages taken from the following

sources:http://www.biologyreference.com/Co-Dn/Cytokinesis.html

http://www.phschool.com/science/biology_place/labbench/lab3/cytokin.html

http://www.nccs.com.sg/kac/abcs/detect.htm

http://www.phd7.idaho.gov/Infectious%20Disease/infectiousdiseasemain.html

http://www-ipcms.u-strasbg.fr/spip.php?article647

http://science.education.nih.gov/supplements/nih1/cancer/activities/activity2_animations.htm

http://www.microscopy-uk.org.uk/micropolitan/botany/frame4.html