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IB Biology HL D4.1.8 Modelling Selection Questions

Evaluate how controlled predation and female preference in Endler guppy experiments model interacting natural and sexual selection.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Analyse how predator visibility and female preference alter guppy colouration frequencies in Endler experiments.
  • Evaluate Endler evidence for interacting natural and sexual selection pressures under controlled experimental conditions.

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Study D4.1.8—Modelling selection conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology HL D4.1.8 Modelling Selection Questions question 1

[Maximum number: 1]

John Endler experimented on populations of guppies (Poecilia reticulata) with different colouration. A male guppy fish is shown with large spots, which makes the fish more attractive to females, but more visible to predators.

Figure for Question IB Biology HL D4.1.8 Modelling Selection Questions question 1 — IB Biology HL

The table shows the male colouration of guppy fish and number of predators in three different ponds.

Table for Question IB Biology HL D4.1.8 Modelling Selection Questions question 1 — IB Biology HL

What can be concluded from the data?

A

There is a positive correlation between numbers of predator X and size of spots.

B

Predator Y has least influence on colouration.

C

There is a negative correlation between number of predators and size of spots.

D

There is no sexual selection.

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