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The Origin of Species - Coggle Diagram

- - - - all the alleles present in a species
    - - groups of interbreeding natural populations that are reproductively isolated from other such groups
    - - prevent genetic exchange between species
  - - - lions and tigers (but not bears, oh my!)
        
        could mate but rarely come into contact
    - - diff mating rituals (diff visual signals or sensory mode of communication) (diff birds have diff songs)
      - differ in pheromones produced
        
        chemical signals
    - - 2 flowers grow together but rarely mate bc one flowers in early spring and the other in summer
    - - diff in structure prevents mating (size, organ incompatibility, etc)
- - - - individual that is reproductively isolated from other members of its species is born
      - polyploidy
        
        produces plants w/ more than 2 sets of chromosomes
        
        autopolyploidy
        
        all the chromosomes come from a single species
        
        allopolyploidy
        
        2 species hybridize, offspring usually infertile
- - - - initially incomplete isolating mechanisms are reinforced by natural selection until they are completely effective
- - - - ex. lungs in fish, wings in insects