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IB Biology SL A4.1 Evolution and Speciation Questions

Practise IB Biology SL A4.1 with questions on variation, natural selection, speciation, adaptation and changes in biodiversity.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • explain evolution as change in heritable characteristics, not acquired traits
  • compare DNA, amino-acid, selective-breeding and homologous-structure evidence
  • link geographic isolation and different selection pressures to reproductive isolation

Covered syllabus points

A4.1.1—Evolution as change in heritable characteristicsA4.1.2—Evidence from sequencesA4.1.3—Evidence from selective breedingA4.1.4—Evidence from homologous structuresA4.1.5—Convergent evolutionA4.1.6—Speciation by splitting of pre-existing speciesA4.1.7—Reproductive isolation and differential selection

Learn this topic

Study A4.1 Evolution and speciation conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

Question 1

[Maximum number: 8]

Explain how the process of evolution occurs.

Question 2

[Maximum number: 1]

What is a piece of evidence that all living organisms share a common ancestor?

A

They manufacture the same proteins.

B

They obtain energy from glucose.

C

DNA triplets code for the same amino acids.

D

Cells can synthesise all the amino acids.

Question 3

[Maximum number: 1]

Jersey (Bos taurus) is a breed of cattle. Cows of this breed produce higher milk yields than cows from other cattle breeds.

Figure for Question 3 — IB Biology SL

What has caused this breed to produce higher milk yields than other cattle breeds?

A

Natural selection

B

Selective breeding

C

Adaptive radiation

D

Random mutations

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