key concept 23.1 DNA Sequences Record the History of Gene Evolution
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Evolution of genomes results in biological diversity
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Genes and proteins are compared through sequence alignment
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Models of sequence evolution are used to calculate evolutionary divergence
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Experimental studies examine molecular evolution directly
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key concept 23.2 Genomes Reveal Both Neutral and Selective Processes of Evolution
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Much of evolution is neutral
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Positive and purifying selection can be detected in the genome
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key concept 23.3 Lateral Gene Transfer and Gene Duplication Can Produce Major Changes
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Lateral gene transfer can result in the gain of new functions
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Most new functions arise following gene duplication
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Some gene families evolve through concerted evolution
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key concept 23.4 Molecular Evolution Has Many Practical Applications
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Molecular sequence data are used to determine the evolutionary history of genes
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Gene evolution is used to study protein function
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In vitro evolution is used to produce new molecules
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Molecular evolution is used to study and combat diseases
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Apply What Youâve Learned
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