sci 9 lesson 3 feb 28 - ch 5.1 cytokinesis checkpoints cancer
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BC Science 9Ch. 5.1 Cytokinesis Checkpoints Cancerpp. 158-161TRANSCRIPT
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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/
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Ch. 5.1 QuizCh. 5.1 QuizYou have ~7 minutes to write the quiz.
Good luck!
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Cytokinesis, Cytokinesis, Checkpoints in the Cell Checkpoints in the Cell Cycle, and CancerCycle, and CancerChapter 5.1 pp. 158-161
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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
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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
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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
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Checkpoints in the Cell Checkpoints in the Cell CycleCycle
p. 159
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Control of the Cell CycleControl of the Cell Cyclehttp://nobelprize.org/educational/medicine/2001/cellcycle.html
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Activity time!Group 1: Onion Root Lab
Activity
Group 2: Cancer Investigation
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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.
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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)
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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
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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
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Cancer AnimationsCancer Animationshttp://science.education.nih.gov/supplements/nih1/cancer/activities/activity2_animations.htm
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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/
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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