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IB Biology HL A3.1.10 Comparison of Genome Sizes Questions

Analyse genome-size tables and graphs to distinguish DNA amount, gene number, functional DNA and organism complexity.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Compare genome sizes and gene numbers using tables, graphs and data from multiple organisms.
  • Explain why genome size does not necessarily correlate positively with organism complexity, including the role of non-coding DNA.
  • Use genome data to distinguish genetic information, genes, chromosomes and total DNA.

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Study A3.1.10—Comparison of genome sizes conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology HL A3.1.10 Comparison of Genome Sizes Questions question 1

[Maximum number: 1]

The scattergraph shows the genome sizes of four Enterococcus species.

Figure for Question IB Biology HL A3.1.10 Comparison of Genome Sizes Questions question 1 — IB Biology HL

What can be concluded about the genomes in Enterococcus?

A

E. pallens has the greatest number of genes.

B

E. faecalis and E. faecium have the same mean number of genes.

C

The total genetic information in Enterococcus is constant within each species.

D

E. pallens has more DNA than E. columbae.

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