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
32.2: Types of Selection
Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural…
Frequency-dependent Selection
32.3: 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…
Genetics: Testing the Role of Multi-copy Plasmids in the Evolution of Antibiotic Resistance
32.5: Genetics: Testing the Role of Multi-copy Plasmids in the Evolution of Antibiotic Resistance
Antibiotic resistance in pathogens is a major health problem and understanding the factors that influence its development is vital to human…
Immunology and Infection: A New Screening Method for the Directed Evolution of Thermostable Bacteriolytic Enzymes
32.6: Immunology and Infection: A New Screening Method for the Directed Evolution of Thermostable Bacteriolytic Enzymes
Directed evolution uses natural selection to engineer proteins to take on properties they don’t normally possess. As an example, this…
Bioengineering: Techniques for the Evolution of Robust Pentose-fermenting Yeast for Bioconversion of Lignocellulose to Ethanol
32.7: Bioengineering: Techniques for the Evolution of Robust Pentose-fermenting Yeast for Bioconversion of Lignocellulose to Ethanol
Plant biomass could support alternative energy creation and reduce petroleum consumption. However, its hydrolysis generates toxins that impair…