IB Biology HL D4.1.8 Modelling Selection Questions
Use Endler's guppy experiments to examine how controlled selection pressures relate to predation, colour patterns and mating success.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- Interpret Endler guppy evidence by relating predator abundance to colour patterns or spot size.
IB Biology HL D4.1.8 Modelling Selection Questions 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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