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VARIATION - Coggle Diagram

- - - - change in in ploidy
      - change in ecology
  - - - Prezygotic barriers
        
        temporal isolation
        
        habitat isolation
        
        behavioral isolation
        
        mechanical isolation
        
        gametic isolation
      - Postzygotic barriers
        
        hybrid inviability
        
        hybrid sterility
        
        hybrid breakdown
- - - - intermediate group is selected
      - environmental stable
      - unfavourable phenotype will be eliminate
    - - extreme type is favoured (lower/highest)
      - occurs when there is a change in environment
      - distribution curve move towards one direction
    - - 2 extreme types are selected
      - occur e=when environmental conditions fluctuated between 2 opposite extreme value
      - cause the presence of polymorphism
  - - - inbreeding
        
        mating between closely related individuals
        
        make sure desirable characters of high quality are propagated
      - outbreeding
        
        selective & controlled crossing among individuals from 2 diff population
        
        hybrids offspring