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Class Topics

Hand in the Mitosis lab and “ The Role of Chromosomes” before the bell rings Review for Chapter 6 Quiz 2 Lab – How long is each phase of mitosis? Begin Chapter 7 It is not enough to have a good mind; the main thing is to use it well. Rene Descartes. To continue learning about Chapter 6.

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Class Topics

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  1. Hand in the Mitosis lab and “The Role of Chromosomes” before the bell rings Review for Chapter 6 Quiz 2 Lab – How long is each phase of mitosis? Begin Chapter 7 It is not enough to have a good mind; the main thing is to use it well. Rene Descartes To continue learning about Chapter 6 Title: Biology 1/9/07 Class Topics Objectives: Friday, December 20, 20195:26 PM

  2. Class Assignments What By When • W.S. “The Role of Chromosomes” 1/9/07 • Mitosis Lab 1/9/07 • Lab – How long is each phase of mitosis? 1/11/07 • Chapter 6 Quiz 2 1/11/07 • Due this class period • Due next class period • Due in the future

  3. Emergency Procedures • Fire • Out door to right, down stairs, outside in parking lot - Stay as a group • Tornado • Out door to right, down stairs and to the right, kneel facing the lockers in the brown hallway - Stay as a group • “Secure the Building” • Stay in your seat and be quiet - some students may have to move to a lab table • Evacuation • Travel as a class to south doors and move down sidewalk to load busses

  4. Grade Sheet

  5. Chapter 6 Mitosis Quiz Review • Chromosomes • Chromatids • Diploid cell • Cell Cycle and Cancer • Interphase • G1 • S • Sequence • Checkpoints/cyclins • Cancer

  6. Chapter 6 Mitosis Quiz Review • Mitosis (general) • Definition • When completed • Mitosis (specific) • Order • Prophase • Spindle fiber • Metaphase • Anaphase • Cytokinesis • When? • Plant cell • Animal cell • Label – pictures of mitosis

  7. How long is each phase of mitosis? • View a section of onion root tip • Count the following • Cells in interphase, prophase, metaphase, anaphase, telophase • Choose a good section • Repeat twice more

  8. Meiosis • Process of cell division - chromosome number is halved • From 2n to n • Formation of gametes • Starts after G1, S, G2 • Chromosomes have been replicated • Sister chromatids (4 arms) • Two divisions • Meiosis I, Meiosis II

  9. Meiosis: step by step • Meiosis I • Prophase I (same as mitosis except…) • The chromosomes pair up with their homolog (the other of the homologous pair) to form tetrads • during synapsis (pairing up), crossing over can occur

  10. Meiosis: step by step • Meiosis I • Metaphase I • homologous pairs line up along equator with spindle fibers attaching to only one side of each centromere • Anaphase I • The spindle fibers pull the homologous chromosomes to the separate poles • This gets the cell into the haploid state • Reduction division

  11. Meiosis: step by step • Meiosis I • Telophase I • Cytokinesis occurs and two haploid cells with sister chromatids have been formed • Meiosis II • Prophase II • Occurs right after telophase I has finished. No interphase between the two

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