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MITOSIS

MITOSIS. FORM 5 GENETICS Prepared By: Ms A. Veira. Cell Division. Old cells die; new cells form by division of chromosomes and cytoplasm

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MITOSIS

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  1. MITOSIS FORM 5 GENETICS Prepared By: Ms A. Veira

  2. Cell Division • Old cells die; new cells form by division of chromosomes and cytoplasm • Mitosis is one type of cell division that is very important for growth, repair, asexual reproduction and maintaining the correct number of chromosomes per organisms.

  3. Revision of the nucleus • The nucleus contains a membrane and inside it are many chromosomes. • Chromosomes hold genetic material that allows each individual to have specific characteristics eg. humans vs cats • Chromosomes are only visible when they are dividing.

  4. What is MITOSIS? • A special type of cell division that allows the same number of chromosomes from the parent cell to be present in the new cells (daughter cells). • Two identical cells form from the parent cell. • This number is the DIPLOID or 2n number of chromosomes.

  5. Chromosome numbers of organisms:

  6. Why is mitosis important? • It prevents mutants and maintains species existence. www.earthweek.com/online/ew070928/ew070928i.jpg http://feedmycuriosity.blogspot.com/2008/08/born-kickin.html

  7. Mutants www.smh.com.au/.../2007/09/27/1190486456395.html www.smh.com.au/.../2006/01/11/1136956230406.html

  8. Why else is mitosis important? • It allows growth and development of cells, tissues, organs etc.;which we need for metabolic processes and survival. science.nationalgeographic.com/.../brain.html www.lbah.com/feline/kidney.htm

  9. Why is it necessary- Cont’d • Asexual Reproduction: Vegetative Propagation and Cloning. www.tutorvista.com/content/science/science-ii... sirenschronicles.com/.../

  10. CELL CYCLE http://www.scq.ubc.ca/wp-content/cellcycle.gif http://www.le.ac.uk/ge/genie/vgec/images/cellcycle.png

  11. Replication Occurs—but why? • To form chromatids(held by a centromere). • To allow the DIPLOID (2n) number to be achieved. http://www.anselm.edu/homepage/jpitocch/genbio/sphase.JPG

  12. Steps involved in Mitosis: Step 1: student.ccbcmd.edu/.../DNArep/pcinterphase.html

  13. Step 2: library.thinkquest.org/.../StagesMitosis.htm

  14. Step 3: library.thinkquest.org/.../StagesMitosis.htm student.ccbcmd.edu/.../DNArep/pcmetaphase.html

  15. Step 4: student.ccbcmd.edu/.../DNArep/pcanaphaseA.html library.thinkquest.org/.../StagesMitosis.htm

  16. Step 5 and 6: library.thinkquest.org/.../StagesMitosis.htm Telophase seximexibio3.blogspot.com/

  17. Summary library.thinkquest.org/.../mitosis.gif

  18. Useful Links: http://www.pbs.org/wgbh/nova/baby/divi_flash.html http://www.ias.unt.edu/~tpp001/Mitosis_Diagram_Page.main.html http://www.newbedford.k12.ma.us/srhigh/amaral/mitosis.htm http://www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBookmito.html http://www.pbs.org/wgbh/nova/baby/divide.html# http://www.biologycorner.com/worksheets/mitomeo.html http://www.google.com.vc/imgres?imgurl=http://www.scq.ubc.ca/wp-content/cellcycle.gif&imgrefurl=http://www.scq.ubc.ca/the-cell-cycle-a-universal-cellular-division-program/&h=241&w=343&sz=17&tbnid=QsWufxrdFHjjHM:&tbnh=84&tbnw=120&prev=/images%3Fq%3Dcell%2Bcycle&hl=en&usg=__n3NvCNdECNwsR3G3UG-dokxJC_Q=&ei=GLY6S57CHMjKlAer1NCeBw&sa=X&oi=image_result&resnum=8&ct=image&ved=0CB8Q9QEwBw

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