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Speciation definitions

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  • Speciation
    Process resulting in the emergence of distinct groups unable to interbreed, often driven by reproductive barriers and genetic divergence.
  • Reproductive Isolation
    Set of mechanisms preventing gene flow between populations, maintaining species boundaries by blocking successful reproduction.
  • Prezygotic Mechanism
    Barrier acting before fertilization, such as behavioral or mechanical differences, preventing formation of a zygote.
  • Postzygotic Mechanism
    Barrier occurring after fertilization, often resulting in offspring that are inviable or sterile, like mules.
  • Biological Species Concept
    Framework defining species based on reproductive compatibility and the ability to produce viable, fertile offspring.
  • Allopatric Speciation
    Formation of new species due to physical separation by geographic barriers, leading to genetic divergence.
  • Sympatric Speciation
    Emergence of new species within the same geographic area, driven by non-geographic reproductive barriers.
  • Genetic Divergence
    Accumulation of genetic differences between populations, often leading to reproductive isolation and speciation.
  • Mechanical Isolation
    Prezygotic barrier where physical differences prevent successful mating between populations.
  • Gamete Isolation
    Prezygotic barrier where incompatibility or timing prevents gametes from fusing, blocking fertilization.
  • Hybrid Sterility
    Condition where offspring from two different species are unable to reproduce, maintaining species separation.
  • Temporal Isolation
    Prezygotic barrier where differences in timing of reproductive activity prevent interbreeding.
  • Ecological Niche
    Specific role or environment occupied by a population, which can drive reproductive isolation and speciation.
  • Offspring Viability
    Ability of hybrid offspring to survive and develop, often reduced by postzygotic barriers.
  • Behavioral Isolation
    Prezygotic barrier where differences in mating rituals or behaviors prevent interbreeding between populations.