Theories of Evolution

• Lamarck's Theory of Evolution (Use and Disuse) - organisms could pass on an acquired trait to their offsprings.
• Darwin's Theory of Evolution (Natural Selection) - organisms adapt and change their traits according to their environment
• Survival of the Fittest - the ability to survive and reproduce
• Natural selection can only select from existing variations
• Origins of genetic variation

  1. mutations
  2. crossing over
• Results of Natural Selection: mimicry, camouflage, diversity, convergent
• Vestigial Structures - saving little to no functions, provides clues about evolutionary history
• analogous structures - structures performing similar functions (convergent)
• Homologous structures - similar in structure, but different functions in different organisms
• Stabilizing Selection - The average of the organisms do the best
• Disruptive Selection - The organisms that's not average do better
• Directional Selection - one of the mutation sides is successful