Directional and Stabilising Selection

• Stabilising selection- The selection which favours average individuals
• Directional selection- selection which favours individuals that vary in one direction from the mean of the population
• Disruptive selection- selection which favours either extreme, but not the average
• stabilising selection

  A) Population after natural selection

  B) Original population

  
• Directional selection

  A) Favours one extreme

  
• Disruptive selection

  A) favours both extremes