Advanced Topics
In a nutshell: Population genetics explains how species adapt and evolve over time.
## How Populations Change Over Time
Population genetics studies how gene frequencies change in groups of organisms over generations.
## Key Concepts
- **Gene Pool**: All the genes in a population.
- **Genetic Drift**: Random changes in gene frequencies, especially in small populations.
- **Natural Selection**: Traits that help survival become more common.
## Evolution in Action
Over time, populations adapt to their environment, sometimes leading to new species.
## Applications
- Tracking the spread of diseases.
- Conserving endangered species.
- Understanding antibiotic resistance in bacteria.
## The Big Picture
Population genetics connects the dots between genes, variation, evolution, and the diversity of life on Earth!
Examples
- Antibiotic resistance spreads in bacteria populations due to natural selection.
- Genetic drift causes rare traits to disappear in small island populations.