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Chapter 32

Natural Selection

What is Natural Selection?
Natural selection is an evolutionary process in which individuals with survival-promoting traits reproduce at higher rates. These favorable traits…
Types of Selection
Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural…
Frequency-dependent Selection
When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is…
Testing the Role of Multicopy Plasmids in the Evolution of Antibiotic Resistance
Multicopy plasmids are extremely abundant in prokaryotes but their role in bacterial evolution remains poorly understood. We recently showed that the…
A New Screening Method for the Directed Evolution of Thermostable Bacteriolytic Enzymes
Directed evolution is defined as a method to harness natural selection in order to engineer proteins to acquire particular properties that are not…
Techniques for the Evolution of Robust Pentose-fermenting Yeast for Bioconversion of Lignocellulose to Ethanol
Lignocellulosic biomass is an abundant, renewable feedstock useful for production of fuel-grade ethanol and other bio-products. Pretreatment and…

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