Evolution

• Theories on the evolution of organisms:

  • Theory of use and disuse
  • Theory of need
  • Theory of descent with modification
  • Theory of evolution by artificial selection
  • Theory of evolution by natural selection
  • Theory of acquired characteristics
• Mechanism of evolution:

  • Natural selection
  • Artificial selection
  • Gene flow: introduction of genetic material (by interbreeding) from one population of a species to another
  • Genetic drift: the frequency of a trait changes by random chance
  • Mutation: genes are damaged or changed, altering the DNA sequence
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