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Chapter 17 Population Genetics and Evolution (evolution and the origin of…

- - - - change allele frequency
    - - factors not natural selection
        
        intention
        
        planning
        
        purpose
        
        voluntary decision
      - most significant factor
- - - - abiological reproductive barrier
        
        physical, nonliving feature
        
        prevents exchange of genes
      - geographic speciation
        
        speciation results
        
        allopatric
    - - biological reproductive barrier
        
        biological phenomenon prevents gene flow
        
        hybrid sterility
      - sympatric speciation
        
        reproductively isolated
        
        grow together
    - - species rapidly diverge
      - founder individuals
        
        offspring resembles the first
      - genetic drift
        
        gene pool changes erratically
- - - - second atmosphere
      - early second atmosphere
        
        reducing atmosphere
    - - heat
      - electricity
      - sun