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IB Biology SL A3.1.6 Diversity in Chromosome Numbers Questions

Chromosome number is usually constant within a species but varies between species. Diploid numbers are even because chromosomes occur in homologous pairs. Examples include fruit fly 8, rice 24, human 46, chimpanzee 48 and dog 78.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • State that chromosome number is usually constant within a species but varies between species.
  • Explain that diploid chromosome numbers are even because chromosomes occur in homologous pairs.
  • Recall the chromosome numbers in the examples: fruit fly 8, rice 24, human 46, chimpanzee 48 and dog 78.

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

State the chromosome number in this gorilla.

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