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IB Biology HL A3.1.13 Hl Chromosome Number As Shared Trait Questions

Practise IB Biology HL A3.1.13 by relating shared chromosome numbers to species traits and interpreting haploid and diploid chromosome data.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Interpret chromosome numbers in gametes and somatic cells of a named species, including haploid and diploid values.
  • Explain why chromosome number is usually constant within a species but differs between species and can prevent fertile hybrids.

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Study A3.1.13 (HL)—Chromosome number as shared trait conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology HL A3.1.13 Hl Chromosome Number As Shared Trait Questions question 1

[Maximum number: 2]

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.

Figure for Question IB Biology HL A3.1.13 Hl Chromosome Number As Shared Trait Questions question 1 — IB Biology HL

Question (a)

(a)

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

[ 2 ]

Question (i)

(i)

State how many chromosomes there would be in gametes of this species.

Figure for Question (i) — IB Biology HL
[ 1 ]

Question (ii)

(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 ]
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