DP Biology (first assessment 2025)

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Question 21M.2.HL.TZ1.5c

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Date May 2021 Marks available [Maximum mark: 1] Reference code 21M.2.HL.TZ1.5c
Level HL Paper 2 Time zone TZ1
Command term Draw Question number c Adapted from N/A
c.
[Maximum mark: 1]
21M.2.HL.TZ1.5c
(c)

Cladistics and other evolutionary evidence suggest that mammals and birds have a more recent common ancestor than mammals and amphibians. Draw a cladogram to show the relationships between mammals, birds and amphibians.

[1]

Markscheme

What is important is that the proper relationships are shown not the style used.

Examiners report

Candidates found it hard to express themselves without contradiction.

Examiners accepted a wide variety of diagrams and orientations as long as the relationships among amphibians, birds and mammals were appropriate. Nevertheless, there was poor performance on this question. It was the question most often left blank in Section A.

Syllabus sections