Chapter 6 Outline
Case Study: Trophy Hunting and Inadvertent Evolution
What Is Evolution?
CONCEPT 6.1 Evolution can be viewed as genetic change over time or as a process of descent with modification.
- Evolution is allele frequency change
- Evolution is descent with modification
- Populations evolve, individuals do not
Mechanisms of Evolution
CONCEPT 6.2 Natural selection, genetic drift, and gene flow can cause allele frequencies in a population to change over time.
- Mutation generates the raw material for evolution
- Natural selection increases the frequencies of advantageous alleles
- Genetic drift is the effect of chance events
- Gene flow is the exchange of alleles between populations
Adaptive Evolution
CONCEPT 6.3 Natural selection is the only evolutionary mechanism that consistently causes adaptive evolution.
- Adaptations result from natural selection
- Adaptive evolution can occur rapidly
- Gene flow can limit local adaptation
- Adaptations are not perfect
The Evolutionary History of Life
CONCEPT 6.4 Long-term patterns of evolution are shaped by large-scale processes such as speciation, mass extinction, and adaptive radiation.
- The diversity of life results from speciation
- Mass extinctions and adaptive radiations have shaped long-term patterns of evolution
Joint Effects of Ecology and Evolution
CONCEPT 6.5 Ecological interactions and evolution exert a profound influence on one another.
- Ecological interactions can cause evolutionary change
- Evolution can alter ecological interactions
Case Study Revisited: Trophy Hunting and Inadvertent Evolution
Connections in Nature: The Human Impact on Evolution
