DP Biology (first assessment 2025)

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Question 19M.2.HL.TZ2.c

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Date May 2019 Marks available [Maximum mark: 3] Reference code 19M.2.HL.TZ2.c
Level HL Paper 2 Time zone TZ2
Command term Outline Question number c Adapted from N/A
c.
[Maximum mark: 3]
19M.2.HL.TZ2.c

Outline the types of evidence that can be used to place a species in a particular clade.

[3]

Markscheme

a. a clade is a group of organisms that have evolved from a common ancestor ✔

b. identify the base sequences of a gene ✔

c. identify amino acid sequence of a protein ✔

d. comparing homologous structures ✔

e. the fewer the differences, the closer they diverged in time from a common ancestor ✔ Accept vice versa.

Examiners report

Those who had been taught it gained at least two marks for evidence and clades, with comparing base sequences of genes and amino acid sequences of proteins amongst the most common correct answers.

Syllabus sections