Evolutionary Biology - Station 11
  • Darwin and Theory
  • Evidence
  • Hardy-Weinberg
  • Mechanism
  • Speciation
  • Origin Of Life
  • Credits
  • Video

Hardy-Weinberg Principle

The principle is named after G. H. Hardy and Wilhelm Weinberg, who first demonstrated it mathematically.
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                                                                          H-W equation: p²+2pq+q²= 1
  • assume 2 alleles: Frequency of dominant allele (B)=p  frequency of recessive allele (b) =q
  • frequencies must add to 1 (100%), so:p+q= 1
  • The origin of genetic variation is mutation -- any change in nucleotide sequences.
  • H-W equilibrium: Hypothetical, non-evolving population → rare in real world          Serves as a model (null hypothesis)
REMOVE all agents of evolutionary change
1.very large population size (no genetic drift)
2.no migration (no gene flow in or out)
3.No net mutations (no genetic change)
4.random mating (no sexual selection)
5.no natural selection (everyone is equally fit)

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  • Darwin and Theory
  • Evidence
  • Hardy-Weinberg
  • Mechanism
  • Speciation
  • Origin Of Life
  • Credits
  • Video