Unit 3 Objectives

Unit 3 Objectives - BIOLOGY 115 LEARNING OBJECTIVES - FALL...

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Unformatted text preview: BIOLOGY 115 LEARNING OBJECTIVES - FALL 2009 Section III: Topics for the Third Examination TOPICS: Cell cycle, Mitosis, Meiosis You should be able to : 1. Describe the role of mitosis and cytokinesis in the life cycle of multicellular and unicellular organisms. • Prophase o First stage of mitosis o Chromatin condenses o Nucleoli disappears o Centrosomes separate and microtubules form o Asters and spindles form • Prometaphase o Nuclear envelope fragments and breaks apart o Centrosomes are at the poles of the cell o Kinetochores centrosomes form at both ends of the cell o Microtubules attach to kinetochores • Metaphase o Chromosomes move to the middle of the cell (metaphase plate) o Kinetochores tug chromosomes to move towards the center of cell o Spindle is complete Centrosomes are at poles Chromosomes are at the center of the cell • Anaphase o Centromere protein separates Sister chromotids separate o Kinetochores microtubules shorten and chromosomes move in opposite direction o Moves towards opposite poles o Each end of the cell has full complement of DNA o Microtubes break apart Look like microtubules are being eaten • Telophase o Nuclear envelope forms around DNA 2 Nuclei in cell o Chromosomes uncoil o Microtubules break apart • Cytokinesis o Cellular division o End of the cell cycle Sometimes occurs at the same time of telophase 2. Define and describe the stages of the eukaryotic cell cycle. • Interphase o Gap 1 (G1) Cell grows in size Organelles double o Synthesis (S) DNA replication Needed prior to cell and nucleus division End of S phase 2 copies of each chromosome Chromosomes held together at centromere Sister Chromosomes • 2 copies of chromosomes Chromotin • DNA in an uncondensed form; unwound o Gap 2 (G2) Preparation of mitosis Cell continues to grow and replicate • Mitosis o See above 3. Define and describe the stages of mitosis in terms of changes in and the movements of the chromosomes (including the role of microtubules) during mitosis. • Prophase o First stage of mitosis o Chromatin condenses o Nucleoli disappears o Centrosomes separate and microtubules form o Asters and spindles form • Prometaphase o Nuclear envelope fragments and breaks apart o Centrosomes are at the poles of the cell o Kinetochores centrosomes form at both ends of the cell o Microtubules attach to kinetochores • Metaphase o Chromosomes move to the middle of the cell (metaphase plate) o Kinetochores tug chromosomes to move towards the center of cell o Spindle is complete Centrosomes are at poles Chromosomes are at the center of the cell • Anaphase o Centromere protein separates Sister chromotids separate o Kinetochores microtubules shorten and chromosomes move in opposite direction o Moves towards opposite poles o Each end of the cell has full complement of DNA o Microtubes break apart Look like microtubules are being eaten • Telophase o Nuclear envelope forms around DNA...
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This note was uploaded on 09/24/2011 for the course BIO 115,116 taught by Professor Staff during the Fall '10 term at Northwestern IA.

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Unit 3 Objectives - BIOLOGY 115 LEARNING OBJECTIVES - FALL...

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