DP Biology (first assessment 2025)

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Question SPM.1A.HL.TZ0.25

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Date May Specimen-2023 Marks available [Maximum mark: 1] Reference code SPM.1A.HL.TZ0.25
Level HL Paper 1A Time zone TZ0
Command term Question number 25 Adapted from N/A
25.
[Maximum mark: 1]
SPM.1A.HL.TZ0.25

Scientists studied differences in the base sequences of a gene found in five animal species in order to determine their evolutionary relationships. A cladogram was constructed based on these differences.


What can be deduced from the cladogram?


A.  There are only three clades shown.

B.  Morphological differences between V and Z increase with time.

C.  There is only one difference between the amino acid sequences of X and Y.

D.  Y and Z have a more recent common ancestor than W and X.

[1]

Markscheme

D

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