5.5 Population Genetics

  • Created by: Rebecca
  • Created on: 19-06-11 20:58

Gene Pool:

  • Population genetics is concerned with determining the relative proportions of the various genotypes present in a population, from which the relative proportions of alleles can be calculated. This is known as allele frequency.
  • A population of organisms that sexually reproduce contains a large amount of genetic variation called a gene pool. 
  • Each organism contains just one of the many possible sets of genes that can be formed from a gene pool.
  • The gene pool remains stable if the environment is stable.
  • If the environment changes the advantageous genotypes are selected for and the disadvantageous genotypes are selected against.
  • Therefore the gene pool is constantly changing.
  • Alleles may become more and less common, or disappear from the gene pool altogether.
  • The Hardy-Weinberg principle states that in a large, randomly mating population, assuming the absence of migration, mutation and selection, the gene and genotype frequencies remain constant. This is, the proportion of dominant and recessive alleles of a particular


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