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IB Biology HL D3.2.6 Phenotypic Plasticity Questions

Explain how an environmental condition can alter gene expression and phenotype without changing genotype in IB Biology HL D3.2.6.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Explain phenotypic plasticity as an environment-driven change in phenotype without a change in genotype, linking the environmental condition to altered gene expression.

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Study D3.2.6—Phenotypic plasticity conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology HL D3.2.6 Phenotypic Plasticity Questions question 1

[Maximum number: 1]

Scientists incubated larvae of the moth Utetheisa ornatrix at either 15∘C15^{\circ} \mathrm{C} or 22∘C22^{\circ} \mathrm{C} until they hatched. They found the hatched moths had different wing colour patterns due to phenotypic plasticity.

Moth from larvae incubated at \(15^{\circ

Moth from larvae incubated at \(15^{\circ

Moth from larvae incubated at \(22^{\circ

Moth from larvae incubated at \(22^{\circ

Which of the following explains the observed differences in wing colour?

A

Colder temperatures induce mutations in genes for wing colour.

B

The expression of genes for wing colour is affected by temperature.

C

A mutation makes moths less visible to predators in cold climates.

D

Wing colour is the result of polygenic inheritance.

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