natural selection can drive change in Allele frequency

• what is directional selection

  favors individuals at one end of the phenotypic range
• what is the phenotypic range

  this is the range of phenotypes
• what will directional selection result in

  a change in allele frequency in a population
• what does a directional selection graph look like

  
• what is stabilizing selection

  favors intermediate variants and acts against extreme phenotypes
• what will stabilizing selection result in

  the prevention of change in Allele frequency and will lead to the stabilisation of the population
• what does a stabilizing selection graph look like