plumiLoci and gene linkage: Edexcel International A Level Biology questions
Edexcel International A Level Biology past-paper questions on 3.3.1 Loci and gene linkage, 2019–2025, with mark schemes and examiner’s reports where available.
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Q2(c)(i)
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All 8 questions on Loci and gene linkage, as a list
- October 2023, AS Unit 2, Q2(c)(i) (1 mark): State what is meant by the term linkage with reference to these two genes. (1)
- October 2023, AS Unit 2, Q2(c)(ii) (1 mark): A statistical test can be used to analyse observed phenotype frequencies and expected phenotype frequencies for the foxglove plants. Which of the following stat
- June 2023, AS Unit 2, Q2(b) (2 marks): Inheritance of different versions of these two genes shows genetic linkage. Explain how the phenotypes of an individual can show genetic linkage in the inherita
- June 2022, AS Unit 2, Q4(b)(i) (1 mark): State what is meant by the term locus. (1)
- June 2022, AS Unit 2, Q7(c) (4 marks): Sweet pea plants were used in an investigation into the inheritance of flower colour, pollen grain length and pea pod shape. Each of these traits is controlled
- June 2021, AS Unit 2, Q3(a)(i) (1 mark): How many of the following statements about this diagram are correct? • there are three gene loci • the pair of chromosomes will be separated into different cell
- June 2021, AS Unit 2, Q3(b)(iii) (2 marks): Explain why alleles b and e are more likely to be inherited together than alleles A and e. (2)
- October 2020, AS Unit 2, Q7(b) (3 marks): Genetic variation increases due to the production of new combinations of alleles. A cell has gene A and gene B with alleles A, a and B, b. Meiosis could produce
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