IB Biology SL D4.1.8 Modelling Selection Questions
Use Endler guppy experiments to explain how experimentally controlled predation and mate-choice pressures change colouration and survival.
- Syllabus
- First assessment 2025
- Course
- Biology SL
- Level
- SL
Exam points
- Explain how Endler controlled predation and sexual-selection pressures in separate guppy populations.
- Relate controlled selection pressure to changes in guppy colouration and survival across generations.
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IB Biology SL D4.1.8 Modelling Selection Questions question 1
John Endler's experiments modelled sexual and natural selection in Trinidadian guppies (Poecilia reticulata) by controlling selection pressures.
What did the experiments of John Endler demonstrate?
A
Guppies have no predators in their natural habitat.
B
Male guppies prefer dull-coloured females for mating.
C
Predation influences the colour of guppies in different environments.
D
Guppies are not affected by the presence of other fish species.
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