Selection and Hardy-Weinberg

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  • Selection and Hardy-Weinberg
    • Selection
      • Directional
        • In response to environmental change
        • Individuals with an extreme type of allele for characteristic survive
      • Stabilising
        • No environmental change
        • Reduce possible phenotypes
        • Individuals with alleles towards the middle are most likely to survive
      • The choice of one characteristic over another as it is more beneficial to survive
    • Hardy-Weinberg Principle
      • Frequency of dominant allele = p Frequency of recessive allele = q
      • p + q = 1
      • p2 + 2pq + q2 = 1
      • No mutations arise
      • The population is isolated, there is no flow of alleles into or out of the population
      • The population is large
      • There is no selection, all alleles are equally likely to be passed to the next generation
      • Mating within the population is random
      • p2 = frequency of homozygous dominant organisms
      • q2 = frequency of homozygous recessive organisms
      • 2pq = frequency of heterozygous organisms


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