Population Genetic2 - In order for all alleles to have an...

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Population Genetics No Mutation In order for allelic frequencies to remain constant, there must be no change in the number of copies of an allele due to mutation. This condition can be met in two ways. A population can experience little or no mutation. Alternatively, it can experience balanced mutation. Balanced mutation occurs when the rate at which copies of a given allele are lost to mutation equals the rate at which new copies are created by mutation. No Immigration or Emigration For allelic frequencies to remain constant in a population, individuals must not move in and out of that population. Whenever an individual enters or exits a population, it takes copies of alleles with it, changing the overall frequency of those alleles in the population. Random Mating
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Unformatted text preview: In order for all alleles to have an equal chance of being passed down to the next generation, mating within the population must be random. Non-random mating can give an advantage to certain alleles, allowing them to be passed down to more offspring than other alleles, increasing their relative frequency in the population. The processes of natural selection, since they usually select for individuals with greatest fitness for a given environment, usually work against random mating: the most fit organisms are most likely to mate. Random Reproductive Success Just as mating must be random, the survival of offspring to reproductive age, or reproductive success, must also be random. Again, natural selection usually works against such randomness....
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