Summary
Evolution is the process by which species change over time due to changes in their gene pools. This can lead to the development of new species through mechanisms like natural selection and genetic drift.
- Theory of Evolution — the idea that species change over time through mechanisms like natural selection and genetic drift.
Example: The development of antibiotic resistance in bacteria. - Allopatric Speciation — the formation of a new species due to geographical barriers separating populations.
Example: Different species of finches on the Galápagos Islands. - Sympatric Speciation — the formation of a new species without geographical barriers, often due to reproductive isolation.
Example: Apple maggot flies that evolved to prefer different types of fruit. - Gene Pool — the total collection of genes and their alleles in a population.
Example: The variety of alleles for flower color in a population of plants. - DNA Analysis and Comparison — using DNA sequences to determine evolutionary relationships between species.
Example: Comparing human and chimpanzee DNA to study their evolutionary link.
Exam Tips
Key Definitions to Remember
- Theory of Evolution
- Allopatric Speciation
- Sympatric Speciation
- Gene Pool
Common Confusions
- Confusing allopatric and sympatric speciation
- Misunderstanding the role of DNA analysis in evolution
Typical Exam Questions
- What is the best measure of evolutionary fitness of an individual in a population? Its success in contributing genes to future offspring
- In order for speciation to occur, what must be true? At least one gene, affecting at least one phenotypic trait, must change
- Which phylogenetic tree represents the evolution of species X, Y, and Z? C
What Examiners Usually Test
- Understanding of speciation mechanisms
- Ability to interpret DNA analysis results
- Knowledge of evolutionary fitness and its implications
