Selection Pressure - Evolution

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Evolution Evolution
  • Home
    • Bibliography
  • Genetic diversity
    • What does it mean?
  • Mutation
    • What is it?
    • Causes of Mutation
    • Types of Mutation
    • Mutations and Genetic Variation
    • Gene Flow
  • Charles Darwin
    • Biography
    • Contribution to Natural Selection
  • Natural Selection
    • Process of Natural Selection
    • The British Peppered Moth
    • Selection Pressure
  • Survival of the Fittest
    • What does it mean?

Natural selection

What is Selection Pressure?

Selection pressure means factors that contribute to selection which variations will provide the individual with an increase chance of surviving over others. Because of selective pressures, organisms with certain phenotypes have an advantage when it comes to survival and reproduction. Over time, this leads to evolution. Selection pressure often leads to an increased chance of survival and benefit the organism's chances of living longer. Selection pressure is based on biotic factors including:
  • competition
  • predation
  • disease
  • parasitism
  • land clearance
  • climate change
  • pollutants
Selection pressure is also based on abiotic factors including:
  • temperature
  • Shelter
  • Sunlight
  • Nutrients
 Picture A silver fox, is an example of artificial selection experiment used in the Soviet Union Picture Populations of light-colored peppered moths decreased rapidly due to selection pressure
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