mel - Exam 3 Review Part 2 To review Mitosis and Meiosis...

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Exam 3 Review Part 2 To review Mitosis and Meiosis use the Blackboard Link to Course Documents for Chapter 9. The following are available: Interactive Summary Animated Tutorials: Tutorial 9.1 Mitosis Tutorial 9.2 Meiosis Activity 9.1 The Mitotic Spindle Activity 9.2 Images of Mitosis Activity 9.3 Sexual Life Cycle Activity 9.4 Images of Meiosis Activity 9.5 Flashcards 1 Activity 9.6 Flashcards 2 Interactive Quiz Suggested Readings Glossary 1. Give an example of how cell division functions in reproduction, growth, and repair. 2. What is binary fission? The means of which prokaryotic cells divide, however eukaryotic cells have a cell cycle of 3 stages interphase, mitosis, and cytokinesis 3. How many chromosomes do you have in your somatic cells? In your gametes? 46 chromosomes in somatic (body) cells and 23 in gametes. 4. Describe the three major stages in the cell cycle. Interphase, mitosis and cytokinesis 5. What are the three subphases of interphase? Describe what occurs during each phase? G1 o Gap between mitosis and S phase S (DNA synthesis) o DNA replication G2 o Prepares cells for division 6. When does DNA replication occur? S phase of interphase 7. What are the main subphases of the M phase? Interphase o Centrosome doubles o microtubules begin to grow out of them to from the asters Prophase o DNA condenses into chromosomes that are visible with a light microscope o Nucleolus disappears o Spindle begins to form out of the asters
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o Centrosomes start to migrate from each other to opposite poles Prometaphase o Nuclear envelope breaks into fragments o Centrosomes have migrated to each pole o Some of the spindle fibers attach to the kinetochores of chromosomes Metaphase o Chromosomes are aligned at the metaphase plate (the equator of the cell) by microtubules Anaphase o Chromatids of each chromosome separate and move to opposite poles o Motor molecules at the kinetochore of each chromatid move along microtubules as they shorten o Resulting in the separation of chromatids o Cell elongates Telophase o The cleavage furrow forms o cell begins to divide o Nuclear envelope and nucleolus reform o DNA becomes less condensed 8. What occurs during cytokinesis? The division of the cytoplasm of the cell that results in two distinct cells. Takes place after mitosis in M phase of cell cycle 9. What is a kinetechore? Spindle fibers attach to the centromere of the chromosome at the region called kinetochore Within each kinetochore are motor proteins 10. During which phase of mitosis does the mitotic spindle form? prophase
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This note was uploaded on 05/03/2008 for the course BIO 1306 taught by Professor Adair,tamarah during the Fall '08 term at Baylor.

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mel - Exam 3 Review Part 2 To review Mitosis and Meiosis...

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