Natural Selection

Natural Selection
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  • Principle #1 Genetic Variation : Genetic Variation is a mutation that leads the population to looking different from each other . A change in the Phenotype . For example brown rabbits and white rabbits they are both rabbits but are a different color from each other . 
  • Principle #2 Overproduction & the Struggle for Existence :  The overproduction is that rabbits have offspring all year . A lot of them die cause they get eaten . The struggle for existence is that the brown rabbits can't camouflage in the white snow like the white rabbits can . 
  • Principle #3 Differential Survival & Reproduction :  The Differential in survival is that the brown rabbits are getting eaten at a much higher percent then the white rabbits . The white rabbits have a higher fitness so they are able to reproduction more offspring then the brown rabbits . 
  • Principle #4 Changes in Gene Pool :  Lets say that the number of white rabbits was equal to the number of brown rabbits . Brown rabbits are dying off very fast so they don't reproduce offspring . Since white rabbits have a favorable trait they have a higher fitness level which lets them reproduce offspring and since there offspring will have the favorable trait they will reproduce and that's how a gene pool changes over time . 
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