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Question 9

From Biology HL Paper 2 (May 2025, TZ2)

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  1. Evolution is the change in the heritable characteristics of a population.
    (a) Describe the evidence for evolution from homologous structures. [4]

(b) Outline the conditions needed and the use of the Hardy–Weinberg equation to calculate allele frequencies in a population. [3]

(c) Explain how evolutionary relationships and cladograms can be used for classification. [8]

Textbook topics in this question

Review the exact course sections assessed by each question part.

Mixed-topic question
9(a)11.3 Evidence for Evolution and Speciation
9(b)11.2 Selection, Gene Pools and Hardy–Weinberg
9(c)11.1 Classification and Cladistics11.3 Evidence for Evolution and Speciation