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Allopatric and Sympatric Speciation definitions

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  • Allopatric Speciation
    Formation of new species due to geographic separation, often involving dispersal or habitat splitting, leading to genetic isolation.
  • Sympatric Speciation
    Emergence of new species within the same geographic area, typically driven by polyploidy or disruptive selection.
  • Reproductive Isolation
    Barrier preventing gene flow between populations, allowing independent evolutionary paths and eventual speciation.
  • Dispersal
    Movement of individuals to a new habitat, resulting in population separation and potential speciation.
  • Vicariance
    Physical splitting of a habitat, such as by a mountain range, dividing populations and restricting gene flow.
  • Gene Flow
    Exchange of genetic material between populations, maintaining genetic similarity unless interrupted.
  • Founder Effect
    Loss of genetic diversity when a small group establishes a new population, often following dispersal.
  • Polyploidy
    Condition of having more than two complete sets of chromosomes, frequently leading to instant speciation in plants.
  • Autopolyploidy
    Chromosome doubling within a single species due to cell division error, resulting in new genetic combinations.
  • Allopolyploidy
    Hybridization between different species followed by chromosome doubling, creating a new species with combined DNA.
  • Disruptive Selection
    Natural selection favoring divergent phenotypes within a population, potentially leading to reproductive barriers.
  • Hybridization
    Interbreeding between two distinct species, sometimes producing sterile or polyploid offspring.
  • Microhabitat Niche
    Specific ecological space within a broader habitat, where organisms may interact mainly with similar types.
  • Sterile Hybrid
    Offspring resulting from parents with different chromosome numbers, typically unable to reproduce.
  • Self-Fertilization
    Ability of an organism to fertilize its own gametes, facilitating speciation in polyploid plants.