IB Biology HL 4.1.8 Modelling selection Question Bank
Practise IB Biology HL 4.1.8 by analysing how predation and mate choice create competing selection pressures.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- Analyse how predator visibility and female preference alter guppy colouration frequencies.
- Evaluate Endler evidence for interacting natural and sexual selection pressures.
D4.1.8—Modelling selection question 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.
The table shows the male colouration of guppy fish and number of predators in three different ponds.
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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