IB Biology SL A3.1.6 Diversity in Chromosome Numbers Questions

Calculate haploid, diploid and autosome numbers, compare species and explain why odd chromosome counts can prevent fertile gamete formation.

Exam points

Calculate and interpret haploid, diploid and autosome numbers from human, chimpanzee, gorilla, rice and insect cell data.
Compare chromosome numbers between species and recognize that diploid number is species-specific rather than a measure of organismal complexity.
Explain how an odd chromosome number prevents homologous pairing in meiosis and the production of viable gametes.

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