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SBI3U – Assigned Homework Thursday, March 12, 2009 – Answer Sheet Read Section 5.1: Mitosis (pages 120-130) Label the following Two Figures: View the following web pages: http://employees.csbsju.edu/hjakubowski/classes/ch331/dna/chromosome.gif http://www.augustatech.edu/anatomy/chapter%203.html Mitosis Centriole Label the following Figures of a cell replicating: Stage: Prophase Spindle Fibre Chromosome Nuclear Membrane Disintegrati ng Stage: Interphase Centriole Aster – Spindle Fibres Forming Chromatin Nucleolus Nuclear Membrane Cell Membrane Centriole Stage: Anaphase Sister Chromatid moving to the pole Centriole Stage: Metaphase Centromere New Cell Membrane Stage: Telophase / Cytokinesis Cleavage Furrow Sister Chromatid Spindle Fibre elongating cell Stage: Telophase / Cytokinesis Cell Type: Animal Spindle Fibre Reforming Nuclear Membrane Cleavage Furrow Sister Chromatid – will uncondense Stage: Telophase / Cytokinesis Cell Type: Plant Can see the new cell wall (cell plate) being formed between the two new daughter cells Read section 5.2: Meiosis (pages 131-142) Label the following Figures of a cell replicating [Meiosis I] and give a brief description of what is occurring during that stage: Stage: Prophase 1 - nuclear membrane is disintegrating - centrioles are moving to poles - homologous chromosomes pair - synapsis (crossing over) - nucleolus disintegrates Stage: Telophase 1 / Cytokinesis 1 - nuclear membrane reforms - chromosomes uncondensed - cell membrane forms between cells – Two unidentical cells Stage: Interphase - centrioles replicate - DNA duplication Stage: Metaphase 1 - homologous chromosomes line up along metaphase plate - spindle fibres attach to centromeres Stage: Anaphase 1 - homologous chromosomes move to opposite poles (still attached at the centromere) Label the following Figures of a cell replicating [Meiosis II] and give a brief description of what is occurring during that stage: Stage: Anaphase 2 opposite poles -sister chromatids move to Stage: Prophase 2 - nuclear membrane disintegrates - centrioles move to opposite poles Stage: Telophase 2 / Cytokinesis 2 Stage: Metaphase 2 - nuclear membrane reforms - sister chromatids uncondensed - new cell membrane formed between cells - cells are haploid - chromosmes line up along metaphase plate Label the following Figure: Crossing Over Centromere Homologous Chromosome Tetrad Homologous Chromosome Sister Chromatids Handouts: The Cell Cycle A Diagrammatic Comparison of Mitosis and Meiosis Mistakes in Meiosis Chromosomes Number Sheet