BIOL110s05-18 - BIOL 110: Principles of Biology Spring 2005...

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1 BIOL 110 : Principles of Biology Spring 2005 Lecture 18, M 3/7/05 http://www.smccd.net/accounts/staplesn/biol110/ Midterm #1: Average 75%, Median 82%; 3 at 100%+ See me THIS WEEK, if you scored < 70%. (Don’t panic!!) Journal Article reports –Topics THIS WEEK in lab. – Go to the library for RECENT journals, online, or newspaper Science sections (be as specific as possible! – include possible reference) Skipping Ch. 24 for now. Read Ch’s 7 & 8! (Cell Division & Genetics)…… & Ch. 9 (portions) = last on exam. REVIEW: Ch. 7: How Cells Reproduce – Eukaryotes: Cell cycle (Interphase: G1, S, G2), Mitosis – Prophase, Metaphase, Anaphase, Telophase – Spindle microtubules, centrioles, kinetochores, centromeres, chromatids (Constancy: 2n Æ 2n!!) TODAY: Ch. 7: How Cells Reproduce – Cytoplasmic Division – Plants & Animals – Meiosis (& sex) Æ 2 nuclear divisions, 1 S-Phase –Cancer
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2 II. Cytoplasmic Division • Usually occurs between late anaphase and end of telophase • Two mechanisms Cell plate formation (plants) Cleavage (animals) A. Cell Plate Formation Vesicles accumulate at central “plate” of spindle contact • Membrane components • Cell wall materials Vesicles begin to fuse Cell Plate forms -- more vesicle fusion Genetically Identical daughter cells now completely separated -- 2 new CW’s and PM’s b/tw
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3 B. Animal Cell Division Cleavage furrow “pinches apart” daughter cells Æ “contractile ring” of actin microfilaments (inside the PM) slide past each other to cause the pinch PART 2: MEIOSIS ** Sexual Reproduction 1. Chromosomes are duplicated in germ cells 2. Germ cells undergo meiosis and cytoplasmic division 3. Cellular descendents of germ cells become gametes Æ NOT identical products!!! 4. Gametes meet at fertilization
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4 1. Asexual Reproduction 1. Single parent produces offspring 2. All offspring are genetically identical to one another and to parent 2. Sexual Reproduction
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BIOL110s05-18 - BIOL 110: Principles of Biology Spring 2005...

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