Lecture 30 - BIOL104-04 Principles of Biology I November...

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BIOL104-04 Principles of Biology I November 10, 2010 Lecture # 30 Ch 10 How Cells Divide
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How do cells divide? • Bacterial cells – Binary fission – Simple form of cell division • Eukaryotic cells – The cell cycle – Mitosis
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What events need to happen during cell division?
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Eukaryotes have chromosomes • A single long DNA double helix • Wrapped around proteins • DNA encodes hereditary information • Genes
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Eukaryotic chromosomes • Chromosome numbers vary between species – Human 46 – Horse 64 – Mosquito 6 • Haploid (n) – One set of chromosomes of an organism • Diploid (2n) – Two sets of chromosomes
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How many chromosomes do we have?
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Homologous chromosomes • Carry the same genes • Alleles – Different versions of the same gene
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Types of cell division • Mitosis – Produces daughter cells that are genetically identical to the parent cell • Meiosis (Chapter 11) – Daughter cells contain HALF the genetic material of the parent cell – Sperm and eggs
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When does mitosis occur? • Growth
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Lecture 30 - BIOL104-04 Principles of Biology I November...

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