The roles of genes and environment in evolution (part 2)

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  • THE ROLES OF GENES AND ENVIRONMENT IN EVOLUTION
    • Is there free interbreeding in a population?
      • Isolating mechanisms can split a population into subgroups
        • Geographic barriers, eg rivers or mountains
        • Seasonal barriers, eg climate change throughout the year
        • Reproductive mechanisms, eg  physical mating is no longer available, the species may  incompatible
        • This leaves two sub populations, alleles will be eliminated or increased
          • Eventually the sub populations will not be able to interbreed and will become new species
    • Genetic drift
      • Fluctuations or changes in allele frequency is genetic drift
        • In extreme cases genetic drift may lead to the elimination of an allele from the population
      • Genetic drift may reduce genetic variation and may reduce the ability of a population to survive a new environment
        • It could contribute to a new species being created
        • It could also contribute to the extinction of a population or species

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