A-Level Biology – Selection and Speciation

This slide show is designed for the AQA A-Level Biology specification, covering key concepts within the populations and evolution unit. It transitions from the mechanisms of selection to the processes governing the formation of new species.

Content Coverage
Natural Selection: Detailed explanations of directional, stabilising, and disruptive selection.

Speciation: Clear distinctions between allopatric (geographical) and sympatric (reproductive) isolation.

Evolutionary Theory: Definitions and applications of biological fitness and the concept of ‘survival of the fittest’.

Gene Mutation: How mutation lead to polypeptide changes.

Assessment: Integrated practice featuring exam questions and curated ‘Save My Exams’ questions with embedded mark schemes for immediate feedback.