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Ch. 17 Population Genetics & Evolution, image demonstrating a gene…

- - - - organisms can't adapt to
    - - purposely change allele frequency
    - - existing alleles decrease
      - new alleles increase
    - - most significant changing gene pool
      - survival of the fittest
    - - purpose
      - intention
      - planning
      - voluntary decision making
- - - - pollen grains have 1 haploid genome
    - - seeds carried by winds, floods, streams
    - - contribute to gene flow
  - - - cause reproductive isolation
      - nonliving feature preventing gene flow
      - geographic speciation
        
        speciation results
        
        allopatric
    - - causes reproductive isolation
      - biological phenomenon prevents gene flow
      - sympatric speciation
        
        groups reproductively isolated
        
        groups grown together
      - prezygotic isolation mechanisms
        
        prevent pollen from moving
      - postzygotic internal isolation barriers
        
        genomes too different
        
        no more interbreeding
    - - species rapidly diverge in short time
      - founder individuals
        
        all offspring resemble first
        
        bc gene pool is small
      - genetic drift
        
        gene pool change rapidly
- - - - second atmosphere
        
        made by gases from rock matrix
        
        & meteorites
        
        reducing atmosphere
    - - UV & gamma radiation from sun
      - heat
      - electricity
    - - no limits bc lack of oxygen at first
  - - - addition of oxygen from photosynthesis