DP Biology (first assessment 2025)

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Question 23M.1A.SL.TZ1.10

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Date May 2023 Marks available [Maximum mark: 1] Reference code 23M.1A.SL.TZ1.10
Level SL Paper 1A Time zone TZ1
Command term Question number 10 Adapted from N/A
10.
[Maximum mark: 1]
23M.1A.SL.TZ1.10

Scientists sequenced the genes in each chromosome of chimpanzees (Pan troglodytes) and humans (Homo sapiens). The graph shows the mean divergence between the genes of these species by chromosome.

[Source: Material from: Mikkelsen, T.S. et al, Initial sequence of the chimpanzee genome and 
comparison with the human genome, 2005 Nature, reproduced with permission of SNCSC.]


What can be deduced from this data?


A.  Autosomes are more similar than Y chromosomes.

B.  There is the same number of chromosomes in humans and chimpanzees.

C.  Humans are more closely related to chimpanzees than to other species.

D.  Smaller chromosomes are more similar than larger chromosomes.

[1]

Markscheme

A

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