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MITOSIS

Mitosis is a crucial type of cell division responsible for growth, repair, and asexual reproduction in organisms. It enables old cells to die and new cells to form, ensuring that daughter cells retain the same number of chromosomes as the parent cell (diploid or 2n). Chromosomes, which contain genetic material, are only visible during cell division. Mitosis not only prevents genetic mutations but also supports the development of tissues and organs necessary for survival. Understanding this process is vital for appreciating cellular biology and genetics.

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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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