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Population Genetic and Evolution

  • Evolution is a change in the genetic composition of a population over time. Natural selection is one mechanism for evolution.
  • Genetic drift is the change in allele frequency due random chance and usually occurs in small populations. The founder effect and the bottleneck effect are examples of genetic drift.
  • The movement of alleles into or out of a population is called gene flow and can result in a change in the frequency of alleles.
  • The Hardy-Weinberg Equation, p2 + 2pq + q2 = 1, can be used to predict the frequencies of alleles and genotypes in populations that meet the following conditions:
    1. Mating is random
    2. No mutations occur
    3. No natural selection is occurring.
    4. The population is large.
    5. There is no immigration or emigration.

Population Genetic and Evolution

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AP Biology Intro