Natural Selection

• Natural selection


  • process in which organisms with desirable alleles and characteristics are ‘selected’ or ‘favoured’ to survive and pass on their allele to their offspring.
  • driving force behind evolution

  
  

  1. Traits variation
  2. Environment
  3. Advantage with reason
  4. Outcome
• Evolution


  The gradual change in the inheritable characteristics of a population over time
• Dark Peppered Moths


  • could camouflage better than the light peppered moths on the tree trunks that were blackened with soot.

  1. Traits variation (dark or light coloured)
  2. Environment (Soot on tree bark due to pollution from industrial revolution)
  3. Advantage with reason (camouflage, prevent predation)
  4. Outcome (survive and reproduce, increased population)
• Varitiation

  Due to :

  • random fertilisations
  • random mutations
  • meiosis