DP Biology (first assessment 2025)

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Question 21M.1A.SL.TZ1.22

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Date May 2021 Marks available [Maximum mark: 1] Reference code 21M.1A.SL.TZ1.22
Level SL Paper 1A Time zone TZ1
Command term Question number 22 Adapted from N/A
22.
[Maximum mark: 1]
21M.1A.SL.TZ1.22

Which process results in decreased variation?

A. Meiosis

B. Mutation

C. Sexual reproduction

D. Natural selection

[1]

Markscheme

D

Examiners report

There was some concern among teachers that this question might be misinterpreted, but three quarters of candidates answered correctly and the discrimination index was high. Natural selection can decrease variation by eliminating alleles that reduce fitness.

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