Chapter 32

Natural Selection

What is Natural Selection?
Natural selection is a process in which intrinsic and environmental factors act on traits with a genetic basis that serve to allow individuals to…
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, these are…
Frequency-dependent Selection
32.3: Frequency-dependent Selection
Natural selection can be influenced by the frequency of different phenotypes within a population. This is referred to a frequency dependent…
Artificial Selection on Trichome Number
32.4: Artificial Selection on Trichome Number
This experiment draws on the ideas of natural selection—taking advantage of existing genetic diversity—but alters trait distribution at a…
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…