GCSE Combined Science (AQA)

622 videos | 38 hours

Definition of Species

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Inheritance, Variation and Evolution Variation and Evolution

Definition of Species

1:45 Variation and Evolution
Spec 4.6.2.2
Previous Evolution by Natural Selection Next Selective Breeding
  • Two populations of one species can evolve into two new species if they become different enough.
  • A species is defined as a group of individuals that cannot interbreed to produce fertile offspring.
  • Example provided: A horse and a donkey can reproduce to create a mule, but since the mule is infertile, horses and donkeys are considered different species.
  • Another example: French bulldogs and pugs can interbreed to produce fertile offspring, indicating they are the same species.
  • The ability to produce fertile offspring is a key criterion in defining species.
  • Other methods exist to categorize species, but the fertility of offspring is the clearest and most important for understanding species classification in this context.

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