chapter 12 - The Cell Cycle cell division as a journey of...

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1 The Cell Cycle r = coefficient of relatedness [0.0 – 1.0] cell division as a journey of the genetic material Roles of Cell Division Reproduction : amoebas Cell renewal : bone marrow cells Growth and development : sand-dollar embryo Genetic material duplication during cell division Chromosome duplication (including DNA synthesis) 0.5 μm Centromere Chromosome duplication Æ 2 chromatides Sister chromatids Separation of sister chromatids Centromeres Sister chromatids Cell Cycle first gap cell growth = G 1 S (DNA synthesis) chromosome duplication INTERPHASE second gap Preparation for cell division = G 2 G 2 OF INTERPHASE lung cell from Newt PROPHASE PROMETAPHASE METAPHASE ANAPHASE TELOPHASE AND CYTOKINESIS
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2 second gap Preparation for cell division = G 2 Mitotic Spindle at Metaphase Microtubules Chromosomes Sister chromatids Aster Centrosome Metaphase plate Kineto- chores Kinetochore microtubules 0.5 μm Overlapping nonkinetochore microtubules 1 μm Centrosome Cytokinesis: animal cell Cleavage furrow 100 μm Contractile ring of Microfilaments actin, myosin Daughter cells Cleavage of an animal cell (SEM) Nucleus Cel plate Chromosomes Nucleolus Chromatin condensing 10 μm Cell Division in Plants Æ onion cells Prophase . The chromatin is condensing. The nucleolus is beginning to disappear. Although not
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chapter 12 - The Cell Cycle cell division as a journey of...

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