DP Biology (first assessment 2025)

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Question 23M.2.SL.TZ2.4cii

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Date May 2023 Marks available [Maximum mark: 1] Reference code 23M.2.SL.TZ2.4cii
Level SL Paper 2 Time zone TZ2
Command term State Question number ii Adapted from N/A
ii.
[Maximum mark: 1]
23M.2.SL.TZ2.4cii

The Chinese pangolin (Manis pentadactyla) is a critically endangered species that has declined in numbers by 80 % since 2000. It inhabits both forest and grassland, where it uses long, powerful claws to open ant and termite nests and ingests the insects using a long, sticky tongue.

[Source: By U.S. Fish and Wildlife Service Headquarters - Manis pentadactyla, CC BY 2.0,
https://commons.wikimedia.org/w/index.php?curid=56589200.
Photo credit to Ms. Sarita Jnawali of NTNC – Central Zoo The United States is
cosponsoring four separate proposals to increase CITES protections for pangolins
from Appendix II to Appendix I, U.S. Fish and Wildlife Service Headquarters -
Manis pentadactyla. CC BY 2.0. File:Manis pentadactyla (29054818144).jpg.
Created: 14 September 2016.]

The Chinese pangolin, Manis pentadactyla, has a diploid chromosome number of 40.

(ii)

Sex is determined in the same way in pangolins as in humans. State how many autosomes there are in somatic cells of M. pentadactyla.

[1]

Markscheme

38
OR
19 pairs;

Syllabus sections