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Lecture15bio - BIOLOGY 1001 Friday Lecture 15 Clicker...

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BIOLOGY 1001 Friday, March 10, 2008 Lecture 15 Clicker Question: An animal cell has 12 chromosomes at the G1 stage of the cell cycle. What is the diploid number of chromosomes for this organism? Answer: 24 What are the Phases of Mitosis? -PMAT P rophase – Preparation M etaphase – Meet in the Middle A naphase – Pulled Apart T elophase – The End Early Prophase – Chromosomes condense and shorten. Centrioles begin to move apart; Spindle forms. Late Prophase – Nucleolus disappears; Nuclear envelope breaks down. Microtubules attach to kinetochores Metaphase – Kinetochores align at cell’s equator. Anaphase – Free spindle fibers push poles apart. Chromatids become independent chromosomes Telophase – Chromosomes begin unwinding. Cytokinesis – Cytoplasm divided along equator. Next Interphase – Spindle disappears; Nucleolus reappears. Events of Cytokinesis 1. Microfilaments form ring around equator. 2. Microfilaments contract. “Waist” pinches off. Clicker Question: If a human skin cell with 46 chromosomes divides by mitosis,
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