plumiMultiple alleles, polygenic inheritance and continuous variation: Edexcel International A Level Biology questions
Edexcel International A Level Biology past-paper questions on 3.6.3 Multiple alleles, polygenic inheritance and continuous variation, 2019–2025, with mark schemes and examiner’s reports where available.
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Q5(d)(ii)
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All 13 questions on Multiple alleles, polygenic inheritance and continuous variation, as a list
- January 2025, AS Unit 2, Q5(d)(ii) (1 mark): The width of peony leaves is an example of polygenic inheritance. Which row is correct for the width of peony leaves? (1) Leaf width is One gene determines dete
- June 2024, AS Unit 2, Q5(a)(i) (1 mark): These alleles are found at the same locus. State what is meant by the term locus. (1)
- June 2024, AS Unit 2, Q5(a)(ii) (2 marks): Explain how these alleles can produce fruit flies with different coloured eyes. (2)
- January 2024, AS Unit 2, Q3(c)(i) (1 mark): State what is meant by polygenic inheritance with reference to this phenotype. (1)
- January 2024, AS Unit 2, Q3(c)(ii) (2 marks): Sketch a labelled graph to show the expected egg laying rate for a population of hens. (2)
- October 2022, AS Unit 2, Q5(b) (3 marks): Seed colour in wheat is an example of polygenic inheritance. There are three genes thought to affect seed colour (A, B, C). Each gene has a dominant and recessi
- January 2022, AS Unit 2, Q6(a) (6 marks): Explain why there is a large variation in the skin colour of the offspring produced from this cross. Use information from the question, and your own knowledge,
- October 2021, AS Unit 2, Q2(b) (1 mark): The height of a wombat is a result of polygenic inheritance. State what is meant by the term polygenic inheritance with reference to wombat height. (1)
- January 2021, AS Unit 2, Q6(a) (2 marks): Sketch a graph to show the distribution for a phenotype showing continuous variation in a population. (2)
- January 2020, AS Unit 2, Q3(a)(i) (2 marks): State what is meant by the term polygenic inheritance. (2)
- January 2020, AS Unit 2, Q3(a)(ii) (1 mark): Which of the following graphs represents the distribution of mass of these beans? (1) A Mass B Mass C Mass D Mass
- January 2020, AS Unit 2, Q3(b)(i) (1 mark): A woman with a height of 1.59 m has a daughter. The father is 1.76 m tall. Calculate the predicted adult height of their daughter. (1) Answer m
- January 2020, AS Unit 2, Q3(b)(ii) (3 marks): Explain why their daughter may not grow to be this height. (3)
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