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CAIE A-Level Biology A2 17.1.3 Genetic Basis of Variation Questions

Use inheritance information and phenotype evidence to explain how genes, alleles and environmental factors generate variation in Cambridge A Level Biology questions, with mark-scheme support.

Syllabus
2028–2030
Course
Biology 9700
Level
A2

Exam points

  • Explain how genes, alleles and environmental factors produce variation, using inheritance information and phenotype evidence to support the conclusion.

CAIE A-Level Biology A2 17.1.3 Genetic Basis of Variation Questions question 1

[Maximum number: 2]

The harlequin ladybird, Harmonia axyridis, is an insect that shows discontinuous variation in colour pattern and continuous variation in body size.

Fig. 9.1 shows three of the colour patterns seen in H. axyridis and the percentage of each in a population.

Fig. 9.1

Fig. 9.1

Suggest the genetic basis of the variation in colour pattern in H. axyridis.

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