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IB Biology SL 3.1.6 Chromosome Numbers

Practise IB Biology SL 3.1.6 by interpreting haploid and diploid chromosome numbers in species and cell data.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Read diploid and haploid chromosome numbers from species and cell diagrams.
  • Use chromosome counts to distinguish gametes, somatic cells and species-specific chromosome numbers.
  • Interpret chromosome-number data without treating a larger number as evolutionary progress.

A3.1.6—Diversity in chromosome numbers question 1

[Maximum number: 1]

The western gorilla (Gorilla gorilla) is the largest primate. Sex determination in gorillas is the same as in humans. The image shows a karyogram of a gorilla.

Figure for Question A3.1.6—Diversity in chromosome numbers question 1 — IB Biology SL

State the chromosome number in this gorilla.

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