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IB Biology A4.1.7 Reproductive isolation & differential selection

IB Biology A4.1.7 Reproductive isolation & differential selection
IB Biology syllabusBiology SL/HLFirst assessment 2025

Practise how reproductive isolation and different selection pressures can separate gene pools and lead populations towards speciation.

How this is tested

  • explain how geographical, temporal or behavioural barriers prevent gene flow
  • link different environments to selection for different traits in separated populations
  • interpret data on breeding, barriers or trait distributions to support speciation claims
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