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IB Biology HL D4.1.12 Hl Types of Selection Questions

Use phenotype-frequency graphs and examples to distinguish directional, stabilizing and disruptive selection and their population effects.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Distinguish directional, stabilizing and disruptive selection from phenotype-frequency distributions and population examples.
  • Explain how each selection type changes the distribution of phenotypes and associated allele frequencies.

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Study D4.1.12 (HL)—Types of selection conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology HL D4.1.12 Hl Types of Selection Questions question 1

[Maximum number: 2]

Male and female human skeletons obtained from different archaeological sites in Greece were studied in order to find trends in human height evolution in Europe. The box-and

whisker plots show heights of skeletons dating from two historical periods: Neolithic (6500-3000 BC) and Roman (146-324 AD).

Figure for Question IB Biology HL D4.1.12 Hl Types of Selection Questions question 1 — IB Biology HL

Phenotypic variation allows natural selection within populations. Compare and contrast directional and disruptive selection.

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