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What is transitional polymorphism?


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Transitional Polymorphism:

  1. When two or more phenotypes that are visibly different occur in the same population of a species, this is referred to as polymorphism.
  2. Polymorphisms demonstrate the presence of many alleles for a particular gene in the gene pool.
  3. Transitional Polymorphism occurs when a gene pool contains two alleles and one allele is gradually displacing the other.
  4. This results from directional selection that removes one allele from the gene pool as a result of significant environmental pressure.
  5. Examples include the peppered moth's light- and dark-melanistic variations (direction of selection determined by environment)

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