Week 4 (Sept 29 - Oct 5) Chp 11 Lectures & Supplementary Information (Blanks)

Mitosis mitosis represents only a small portion of

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Unformatted text preview: itosis represents only a small portion of The Cell Cycle MITOTIC PHASES Students should know the proper terminology listed in Table 11.1 Structures involved in Mitosis Fig. 11.7 Mitosis and Cytokinesis MITOSIS (Nuclear Division) consists of: PROPHASE PROMETAPHASE METAPHASE ANAPHASE TELOPHASE PROPHASE (THE PREPARATION PHASE) In the Nucleus: chromosomes compacted in nucleus - nucleoli begin to disappear - chromatin fibers contract (DNA condenses) by tightly coiling - chromosomes are visible and consist of two identical sister chromatids joined together at the centromere In the Cytoplasm: - mitotic spindle forms (microtubules polymerize) - assembly of microtubules begins in the centrosome (animals) or microtubule organizing centre (plants) - in animals, the centrioles begin to move apart to opposite sides of nucleus (2 poles) PROMETAPHASE - chromosomes do not appear completely aligned or organized - nucleoli disappear and nuclear envelope breaks down - a specialized structure called a kinetochore is formed near the centromere - spindle fibers attach to sister chromatids at the kinetochore regions - kinetochore microtubules are polymerized, randomly oriented at first, then they become aligned parallel with microtubules - kinetochore microtubules begin moving the chromosomes towards the middle of the cell Use this IPPMATC I Prefer Partying Mainly At The Club 4 KINETOCHORE Microtubules - extend from the poles to the kinetochores - attach to the kinetochores atta...
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This note was uploaded on 10/14/2012 for the course ASTRO 1f03 taught by Professor Perkins during the Spring '12 term at McMaster University.

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