DP Biology (last assessment 2024)

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Question 23M.1.HL.TZ2.33

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Date May 2023 Marks available [Maximum mark: 1] Reference code 23M.1.HL.TZ2.33
Level HL Paper 1 Time zone TZ2
Command term Question number 33 Adapted from N/A
33.
[Maximum mark: 1]
23M.1.HL.TZ2.33

The graphs show how the frequency (f) of a trait within a population changes when subjected to selection pressures. Which graph shows stabilizing selection?

[1]

Markscheme

B

Examiners report

This question showed graphically how the frequency (f) of a trait within a population changes when subjected to selection pressures. The X-axis of the graphs was labelled 'Time' which was incorrect with the normal labelling for similar graphs being 'Trait'. Despite the mislabelling of the axis, the graphs seemed to be familiar to the students and the question performed well statistically with good discrimination and 67% of the candidates answering correctly. This graph has been correctly labelled in the published paper.

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