IB Biology Core 2.5: Cell Division


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PPTX for students studying IB Biology with links to animations and videos

  • Contact Top Class IB Tutors for any assignment help: Email: ramprhr@gmail.com Website: www.topclassibtutors.com IB Biology IA labs extended essay help tutors example sample Online Assignment Help/Tuition all over the world (100% guarantees for top class grades); Mail us or call us for any query: Ph: +91 9911918255 and +91 9918492994 Biologists investigate the living world at all levels using many different approaches and techniques. At one end of the scale is the cell, its molecular construction and complex metabolic reactions. IB biology tutors can offer general or specific support in any area of biology; Anatomy, Botany, Genetics, Human, Immunology, Microbiology, Physiology, Zoology. We offer specialise service for IB DP HL SL Studies Biology IA Labs and extended essay. IB Tutor provides assignment writing help in all the IB subjects. 1 IB maths mathematics studies IA tutor help HL SL exploration extended essay example sample 2. IB physics IA labs extended essay help tutors example sample 3. IB chemistry IA labs extended essay help tutors example sample 4. IB Biology IA labs extended essay help tutors example sample 5. IB written task WT 1 & 2 help tutors example sample 6. IB Written Assignment WA 1 & 2 online help tutors example sample 7. IB English Extended Essay EE online help tutors example sample 8. IB English IOP IOC online help tutors example sample 9. IB theory of knowledge (TOK) essay help tutors example sample, TOK Presentation help guidance 10. IB economics IA commentary extended essay help tutors example sample eco 11. IB business management bm IA extended essay help tutors sample example 12. IB ITGS (information technology in a global society) project extended essay help tutors example sample 13. IB history geography IA extended essay help tutors example sample 14. IB Environmental systems & society ESS Lab Report IA Extended Essay EE Help Tutor Sample Example Online
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IB Biology Core 2.5: Cell Division

  1. 1. IB Biology2 Cells2.5 Cell DivisionAll syllabus statements ©IBO 2007All images CC or public domain or link to original material.Jason de Nys http://commons.wikimedia.org/wiki/File:Scotchquaileggs.jpg
  2. 2. 2.5.1 Outline the stages of the cell cycle, including interphase (G1, S, G2), mitosis and cytokinesis Interphase is the longest portion of a cell’s life and has three subdivisions: First Gap G1 http://commons.wikimedia.org/wiki/File:First_gap_cell_lifecycle.svg
  3. 3. Synthesis Shttp://commons.wikimedia.org/wiki/File:Synthesis_cell_lifecycle.svg
  4. 4. Second Gap G2http://commons.wikimedia.org/wiki/File:Second_gap_cell_lifecycle.svg
  5. 5. Mitosis: 4 Main stages http://commons.wikimedia.org/wiki/File:Prophase_procariotic_mitosis.svgttp://commons.wikimedia.org/wiki/File:Metaphase_procariotic_mitosis.svgmedia.org/wiki/File:Anaphase_procariotic_mitosis.svghttp://commons.wiki The cell divides it’s chromosomes into 2 identical sets media.org/wiki/File:Telophase_procariotic_mitosis.svg Detail in 2.5.4
  6. 6. Cytokinesishttp://commons.wikimedia.org/wiki/File:Cytokinesis_eukaryotic_mitosis.svg
  7. 7. Stage EventsGap 1 (G1) • Protein Synthesis • Organelles produced • Cytoplasm increases in sizeSynthesis (S) DNA is duplicatedGap 2 (G2) • Organelles produced • Cytoplasm increases in sizeMitosis The cell divides it’s chromosomes into two identical sets 4 Stages • Prophase • Metaphase • Anaphase • TelophaseCytokinesis The parent cell divides into two daughter cells
  8. 8. 2.5.2 State that tumours (cancers) are the result of uncontrolled cell division and that these canoccur in any organ or tissue. In cancerous cells, control of mitosis has been lost and they divide… and divide… and divide. This leads to tumours (cancer tissue) that displaces healthy tissue and interferes with proper function. Cancer can arise from any cells capable of mitosis Background: A Brenner tumour in an ovary. These are usually benign, but can be malignant http://commons.wikimedia.org/wiki/File:Brenner_tumour_intermed_mag.jpg
  9. 9. 2.5.3 State that interphase is an active period in the life of the cell when many metabolicreactions occur, including protein synthesis, DNA replication, and an increase in the number ofmitochondria and chloroplasts. State: give a specific name, value or other brief answer without explanation or calculation The name ‘interphase’ implies a period of time between stages and that nothing much is going on. This is not the case! This is when the cell is going about it’s day-to-day ‘business’ i.e. carrying out it’s programmed functions and growing. Imagine if cells did not have a growth phase. What would happen to the size of daughter cells with progressive rounds of mitosis?
  10. 10. Think: What elsewould have tostop when thechromatin istightly coiled andcondensed intochromosomes formitosis? http://commons.wikimedia.org/wiki/File:Chromosome.svg
  11. 11. That’s right,transcription can’t bedone when the DNA istightly coiled.So Interphase is whenall of the cell’s geneticinstructions areprocessed. http://commons.wikimedia.org/wiki/File:Chromosome.svg
  12. 12. Extension: http://www.flickr.com/photos/seyyed_mostafa_zamani/4266283238/
  13. 13. 2.5.4 Describe the events that occur in the four stages of mitosis ^C
  14. 14. ProphaseMetaphaseAnaphase First 3D video of mitosis. Source forgotten, let me know if you know!Telophase
  15. 15. PeaMAT http://www.flickr.com/photos/cmatsuoka/3732303102/ http://www.flickr.com/photos/zaser/2524931166/
  16. 16. PeopleMeetAndTalk http://www.flickr.com/photos/chuckp/252924532/
  17. 17. 2.5.5 Explain how mitosis produces two genetically identical nuclei Think back to slide 3… What happens during the synthesis part of interphase?
  18. 18. Synthesis Shttp://commons.wikimedia.org/wiki/File:Synthesis_cell_lifecycle.svg
  19. 19. So, the chromosomes in the nucleus have been exactly copied See: Replication Core 3.4, AHL 7.2 During Prophase the Chromatin condenses into the familiar X shaped chromosome, which is actually two identical chromatids joined at the centromere. And then when the chromosomes split in half during anaphase, the identical chromatids are dragged to opposite ends of the cell Cytokinesis cuts the cell in half, with one set of duplicate DNA in one daughter cell and the other identical set in the other daughter cell ∴ Both nuclei are ∴ Both nuclei are identical identical http://www.flickr.com/photos/wellcomeimages/5987498303/http://w ww.flickr.com/photos/thejcb/4117622551/
  20. 20. 2.5.6 State that growth, embryonic development, tissue repair and asexual reproduction involvemitosis Any time new cells are required, mitosis is required: • Growth: An 18 year old has many more cells than an 18 month old! • Embryonic development: You start as a zygote, one cell! • Tissue repair: Burnt, bashed, cut or eaten; dead or lost cells need to be replaced. • Asexual reproduction: In eukaryotes only remember: what do prokaryotes do?
  21. 21. Make your own Play Doh™ or Plasticine™ mitosis modelto further your understanding make your own playdough! http://www.flickr.com/search/?l=cc&mt=all&adv=1&w=all&q=mitosis&m=text
  22. 22. Further information: Three of the best sites for IB-specific Biology information. The top link takes you to the PPT by Stephen Taylor