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Mitosis and meiosis slides


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Mitosis and meiosis slides

  1. 1. Mitosis and Meiosis
  2. 2. What is this a picture of?1 2 34 5 6
  3. 3. Mitosis Notes Mitosis is when a cell separates the chromosomes in its nucleus to make two identical cell copies
  4. 4. Cell Division Cycle (Cell Cycle) Periods of the Cell Cycle: 1. Interphase: when cell grows and duplicates DNA a. G1(gap or growth phase): cell prepares to replicate chromosomes b. S (Synthesis) phase: DNA synthesis or replication occurs c. G2 (gap or growth phase): cell   prepares for mitosis by making microtubules to pull apart chromosomes 2. Mitosis: chromosome separates 3. Cytokinesis: cell forms a cleavage furrow and divides into two identical cells
  5. 5. Importance of Mitosis 1. Growth – cells divide to help you grow  2. Repair and Renewal – need cells to divide to heal wounds and replace old dead cells 3. Reproduction- organisms that reproduce asexually use mitosis to make new organisms  Usually spores  Different from bacterial reproduction
  6. 6. Mitosis Picture SortDirections:1. Put the pictures of mitosis in the correct order.2. Match the picture with the name of each step of mitosis3. Match the description with picture and name of each step of mitosis4. Finally, paraphrase description and copy onto notes
  7. 7. Hello!Hi gang!I have completely lost my voice. But, don’t worry. We will stillhave lessons today. Yay! I will need your full attention today. Iwill also need all of you to help each other and make sureeveryone is on task. Warm up is on the white board. Here is ouragenda:1. Meiosis Notes2. Peer Review Introduction (Make sure you have a hard copy of your introduction with you)3. Reading Packet – Annotations and 1 Page PD due
  8. 8. Meiosis NotesMake sure you have a copy of the meiosis notes!Today, we will be doing notes a little differently. First, we willdo our usual note taking. Then, we’re going to watch avideo on meiosis and I will take notes with you as we watchthe video. Feel free to let me know if you want to pause orhave any questions.
  9. 9. MeiosisMeiosis is how sex cells (sperm and eggs) are made from germcellsOverview of Meiosis Video- Video (– Remember, I will be taking down notes with you on the whiteboard. Get markers if you need. There are a lot of parts to it.I also need someone near the laptop to help me pause the* video. Thanks!
  10. 10. Draw Something – Mitosis and Meiosis Review SOMEONE READ THE INSTRUCTIONS BELOW Take out your genetics, mitosis, meiosis notes One person will randomly be selected to be the drawer. Quanina will provide the drawer with the word you need to draw on the white board and the category to the class. The drawer may not give hints on the board After the drawer is finished with the drawing, people can shout out potential answers. If the person gets it correct, the person who answered correctly can choose another drawer. If the person does not answer correctly, the drawer can change his drawing or wait Playing for Points (participaton pts for ppl who participate :-)
  11. 11. Peer Review Introduction Papers Swap your introduction paper with at least 3 people Write annotated by: Your Name on the top front page before you review the paper Check for Technicalities, Completeness, or Cohesiveness in  Technicalities: grammar errors, spelling, sentence structures, etc  Completeness: does it have all of the required elements (check introduction handout and make sure it includes everything asked for)  Cohesiveness: Do the paragraphs connect the main idea of the introduction? Are there parts of the text that are unnecessary?
  12. 12. Peer Review Introduction PapersWhen you are done, show me your paper for a final lookover and you can start revising it or working on your readingpacketReading Packet Due Wednesday April 18Final Draft of Introduction Due Friday April 20
  13. 13. BEFORE YOU LEAVE (11:07a)Reading Packet Due Wednesday April 18Final Draft of Introduction Due Friday April 20thBefore you leave make sure I see you paper with the namesof the 3 graders for credit!
  14. 14. Meiosis IInterphase 1: Chromosomes replicate (S phase) Cell grows and prepares for Meiosis I (G1 and G2) Centrosomes (proteins that pull apart DNA) replicate  
  15. 15. Meiosis IProphase I: Homologous chromosomes find each other and form Tetrads Crossing over occurs between non-sister chromatids  Crossing over: parts of the DNA switches between non-sister chromatids Spindles attach Chromosomes see white board
  16. 16. Meiosis IMetaphase I Tetrad (pairs of homologous chromosomes)lines up on the metaphase plate Homologous chromosomes line up in a random order.
  17. 17. Meiosis IAnaphase I Homologous chromosomes get pulled toward the poles (where centrosomes are)
  18. 18. Meiosis ITelophase I and Cytokinesis Cleavage furrow forms and cell divides into 2 cells Each cell has one copy of two sister chromatids
  19. 19. Differences between Meiosis I and Mitosis Homologous chromosomes find each other and form Tetrads in Meiosis but not Mitosis Crossing over occurs between non-sister chromatids in Meiosis but not Mitosis Homologous chromosomes line up in a random order in Meiosis but not Mitosis
  20. 20. Video Recap
  21. 21. Meiosis II Prophase II  Chromosomes are in pairs (diads)  Spindle forms
  22. 22. Meiosis II Metaphase II  Chromosomes line up on the metaphase plate  Kinetochores of sister chromatids are attached to microtubules that link to the poles
  23. 23. Meiosis II Anaphase II  Sister chromatids separate and move to opposite poles
  24. 24. Meiosis II Telophase II and Cytokinesis  Nuclei(nucleus) forms and chromosomes decondense  Four haploid daughter cells are produced  We can now make babies!
  25. 25. Meiosis Mitosis