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CAIE A-Level Biology 17.2.2 Stabilising, Disruptive and Directional Selection

Practise identifying stabilising, disruptive and directional selection from frequency curves, then explain which phenotypes are favoured under the stated pressure.

Syllabus
2028–2030
Course
Biology 9700
Level
A2

Exam points

  • identify the selection type from a shifted, narrowed or bimodal distribution curve
  • explain which extreme or intermediate phenotypes survive under the selection pressure

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