Evolution

Science

Definition

The change in allele frequencies in a population over successive generations. Evolution explains how species change over time through mechanisms like natural selection, genetic drift, mutation, and gene flow, leading to the diversity of life on Earth.

Examples

  • Antibiotic-resistant bacteria evolving due to overuse of antibiotics
  • Darwin's finches developing different beak shapes for different food sources
  • Peppered moths changing color frequency during the Industrial Revolution
Key Fact

Evolution acts on populations, not individuals; individuals do not evolve

Related Terms

Natural selection Evidence of evolution Speciation Hardy-weinberg

Study This Concept

Practice evolution with free review games in these units:

AP Biology Unit 7: Natural Selection