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CAIE A-Level Biology 17.3.3 Speciation Through Genetic Isolation

Practise distinguishing allopatric and sympatric speciation, then trace blocked gene flow, different selection pressures and accumulated change to reproductive isolation.

Syllabus
2028–2030
Course
Biology 9700
Level
A2

Exam points

  • trace a geographical barrier and different selection pressures to allopatric speciation
  • link ecological or behavioural separation without a barrier to sympatric speciation
  • explain reproductive isolation as blocked gene flow between diverging gene pools

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