Describe one biological process or mechanism that helps you explain gene pool and allele frequency..

A high-scoring response should include precise scientific terminology, a clear sequence of ideas, and explicit reference to Populations.

For this question, start with the A-Level concept in Populations, then connect it to the scenario using gene pool, allele frequency and a clear cause-and-effect chain. This variation checks whether the learner can turn the approved objective into a coherent exam response with clear biological reasoning. Distractors usually fail because they reverse the mechanism, use the wrong scale of organisation, or describe a related topic without answering the exact objective.