Chapter 1 Introduction

Chapter 1 Introduction - Properties of Life Unity All...

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1 Properties of Life Unity All modern forms of life display a common set of characteristics Based on biological evolution Diversity Many types of environments with diverse organisms
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2 Seven Characteristics of Life 1. Cells and organization 2. Energy use and metabolism 3. Response to environment 4. Regulation and homeostasis 5. Growth and development 6. Reproduction 7. Biological evolution
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3
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4 Levels of Organization 1. Atoms 2. Molecules 3. Cells 4. Tissues 5. Organs 6. Organism 7. Population 8. Community 9. Ecosystem 10. Biosphere
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5 Evolutionary History Life began on Earth as primitive cells 3.5-4 bya Those primitive cells underwent evolutionary changes that gave rise to the species we see today Understanding evolutionary history helps us understand the structure and function of an organism’s body
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6 Example Evolutionary change involves modifications of existing structures Structures may be modified to serve new purposes Legs used for walking; dolphin’s flipper or a bat’s wing
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7 Two mechanisms of evolutionary change 1. Vertical descent with modification Progression of changes in a lineage New species evolve from pre-existing species by the accumulation of mutations Natural selection takes advantage of beneficial mutations
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8 2. Horizontal gene transfer Genetic exchange between different species Relatively rare Genes that confer antibiotic resistance are sometimes transferred between different bacteria species
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9 Tree or web of life? Horizontal gene transfer was an important
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This note was uploaded on 09/16/2010 for the course BIO 1A taught by Professor Ahuja during the Summer '10 term at Laney College.

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Chapter 1 Introduction - Properties of Life Unity All...

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