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IB Biology HL A3.1.6 Diversity in Chromosome Numbers Questions

Interpret ploidy and autosome data, compare species and explain chromosome-number evolution through fusion, fission and polyploidy.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Calculate or identify haploid, diploid, autosome and ploidy values from cell diagrams and species data.
  • Explain chromosome-number diversity using chromosome fusion, fission and polyploidy, including the human–chimpanzee chromosome-2 example.
  • Compare chromosome numbers between species and distinguish chromosome count from genome complexity.

IB Biology HL A3.1.6 Diversity in Chromosome Numbers Questions question 1

[Maximum number: 1]

The diploid number of chromosomes in humans (Homo sapiens) is 46 and the diploid number of chromosomes in rice (Oryza sativa) is 24. What does this indicate about diploid chromosome numbers?

A

Plant species have a lower diploid number of chromosomes than animals.

B

Members of a species have the same diploid number of chromosomes.

C

The evolutionary progress of species is determined by the diploid number of chromosomes.

D

The complexity of the organisms is correlated to the diploid number of chromosomes.

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