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Populations: AQA A‑Level Biology questions

Every AQA A-Level Biology exam question on 3.7.2 Populations, 2016–2025, with its mark scheme and examiner’s report.

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1,383 questions

  1. Q09.1

    June 2025 · Paper 2

    2 marks3.7.2 Populations
    The whole paper ↗
    June 2025 Paper 2, question 09.1: Calculate how many more people had CF than was expected in 2022. You can assume the relative frequency of CF in a population remains constant. Show your working

  2. Q05.1

    June 2025 · Paper 3

    2 marks3.7.2 Populations
    The whole paper ↗
    June 2025 Paper 3, question 05.1: The frequency of live births with CLP is 1 in 700 Despite knowing this frequency, the Hardy–Weinberg equation cannot be used to estimate any allele frequencies

  3. Q04.3

    June 2024 · Paper 2

    2 marks3.7.2 Populations
    The whole paper ↗
    June 2024 Paper 2, question 04.3: A population of fruit flies contained 19% grey-bodied flies. Use the Hardy–Weinberg equation to calculate the percentage of flies heterozygous for gene G. Show

  4. Q05.2

    June 2024 · Paper 3

    3 marks3.7.2 Populations
    The whole paper ↗
    June 2024 Paper 3, question 05.2: The population of the Faroe Islands is 49 053 Estimate the number of people in the Faroe Islands with LS caused by a mutation in the SURF1 gene. Use information

  5. Q04.4

    June 2023 · Paper 2

    2 marks3.7.2 Populations
    The whole paper ↗
    June 2023 Paper 2, question 04.4: In a population, 36% of cats had the F allele and had white fur. Use the Hardy–Weinberg equation to calculate the frequency of the f allele in this population.

  6. Q06.6

    June 2023 · Paper 3

    2 marks3.7.2 Populations
    The whole paper ↗
    June 2023 Paper 3, question 06.6: In mice, one type of autoimmune disease is inherited as a dominant allele. Would the Hardy–Weinberg principle hold true for a population of mice, some of which

  7. Q06.4

    June 2022 · Paper 2

    1 mark3.7.2 Populations
    The whole paper ↗
    June 2022 Paper 2, question 06.4: The frequencies of the IA and IO alleles were 0.15 and 0.65. What is the frequency of the IB allele? [1 mark] Frequency of IB allele

  8. Q06.5

    June 2022 · Paper 2

    2 marks3.7.2 Populations
    The whole paper ↗
    June 2022 Paper 2, question 06.5: Name the statistical test you should use to determine if the observed frequencies of the four phenotypes differed significantly from the frequencies expected ac

  9. Q06.6

    June 2022 · Paper 2

    2 marks3.7.2 Populations
    The whole paper ↗
    June 2022 Paper 2, question 06.6: The scientists concluded that the observed frequencies of the four phenotypes differed significantly from the expected frequencies. Use your knowledge of the Ha

  10. Q01.1

    November 2021 · Paper 3

    2 marks3.7.2 Populations
    The whole paper ↗
    November 2021 Paper 3, question 01.1: In a population of 34 S. carolinensis, 2 had black fur. Use the Hardy–Weinberg equation to estimate how many squirrels in this population had brown-black fur. S

  11. Q01.2

    November 2021 · Paper 3

    1 mark3.7.2 Populations
    Mark scheme (PDF)
    The whole paper ↗
    November 2021 Paper 3, question 01.2: The actual number of squirrels in this population that had brown-black fur was 16. Use all of the information to calculate the actual frequency of the C G allel

  12. Q06.2

    November 2021 · AS Paper 2

    1 mark3.7.2 Populations
    The whole paper ↗
    November 2021 AS Paper 2, question 06.2: Suggest why the scientist took his sample from the population at random. [1 mark]

  13. Q06.4

    November 2020 · Paper 2

    2 marks3.7.2 Populations
    The whole paper ↗
    November 2020 Paper 2, question 06.4: A population of this species of plant contained 9% of red-flowered plants. Use the Hardy–Weinberg equation to calculate the percentage of pink-flowered plants i

  14. Q06.5

    June 2019 · Paper 2

    2 marks3.7.2 Populations
    The whole paper ↗
    June 2019 Paper 2, question 06.5: A population of fruit flies contained 64% grey-bodied flies. Use the Hardy–Weinberg equation to calculate the percentage of flies heterozygous for gene G. [2 ma

  15. Q09.2

    June 2018 · Paper 2

    2 marks3.7.2 Populations
    The whole paper ↗
    June 2018 Paper 2, question 09.2: Use the information provided to explain why the number of people showing LP would rapidly increase once selection for this condition had been established. [2 ma

  16. Q10.2

    June 2018 · Paper 2

    2 marks3.7.2 Populations
    The whole paper ↗
    June 2018 Paper 2, question 10.2: 1 0 Read the following passage. Complete achromatopsia is a form of complete colour blindness. It is caused by having only rods and no functional cone cells. Pe

  17. Q07.5

    June 2017 · Paper 2

    2 marks3.7.2 Populations
    The whole paper ↗
    June 2017 Paper 2, question 07.5: A population of summer squash plants produced only green and yellow fruit. The percentage of plants producing yellow fruit in this population was 36%. Use the H

  18. Q09.1

    June 2017 · Paper 2

    1 mark3.7.2 Populations
    The whole paper ↗
    June 2017 Paper 2, question 09.1: What is a gene pool? [1 mark]

  19. Q10.3

    June 2017 · Paper 2

    2 marks3.7.2 Populations
    The whole paper ↗
    June 2017 Paper 2, question 10.3: 1 0 Alzheimer’s disease (AD) is a non-reversible brain disorder that develops over a number of years. At the start of 2014 the number of Americans with AD was e

  20. Q06.1

    Specimen · Paper 2

    2 marks3.7.2 Populations
    The whole paper ↗
    Specimen Paper 2, question 06.1: Frequency of heterozygotes in population in 2003 5
All 20 questions on Populations, as a list
  1. June 2025, Paper 2, Q09.1 (2 marks): Calculate how many more people had CF than was expected in 2022. You can assume the relative frequency of CF in a population remains constant. Show your working
  2. June 2025, Paper 3, Q05.1 (2 marks): The frequency of live births with CLP is 1 in 700 Despite knowing this frequency, the Hardy–Weinberg equation cannot be used to estimate any allele frequencies
  3. June 2024, Paper 2, Q04.3 (2 marks): A population of fruit flies contained 19% grey-bodied flies. Use the Hardy–Weinberg equation to calculate the percentage of flies heterozygous for gene G. Show
  4. June 2024, Paper 3, Q05.2 (3 marks): The population of the Faroe Islands is 49 053 Estimate the number of people in the Faroe Islands with LS caused by a mutation in the SURF1 gene. Use information
  5. June 2023, Paper 2, Q04.4 (2 marks): In a population, 36% of cats had the F allele and had white fur. Use the Hardy–Weinberg equation to calculate the frequency of the f allele in this population.
  6. June 2023, Paper 3, Q06.6 (2 marks): In mice, one type of autoimmune disease is inherited as a dominant allele. Would the Hardy–Weinberg principle hold true for a population of mice, some of which
  7. June 2022, Paper 2, Q06.4 (1 mark): The frequencies of the IA and IO alleles were 0.15 and 0.65. What is the frequency of the IB allele? [1 mark] Frequency of IB allele
  8. June 2022, Paper 2, Q06.5 (2 marks): Name the statistical test you should use to determine if the observed frequencies of the four phenotypes differed significantly from the frequencies expected ac
  9. June 2022, Paper 2, Q06.6 (2 marks): The scientists concluded that the observed frequencies of the four phenotypes differed significantly from the expected frequencies. Use your knowledge of the Ha
  10. November 2021, Paper 3, Q01.1 (2 marks): In a population of 34 S. carolinensis, 2 had black fur. Use the Hardy–Weinberg equation to estimate how many squirrels in this population had brown-black fur. S
  11. November 2021, Paper 3, Q01.2 (1 mark): The actual number of squirrels in this population that had brown-black fur was 16. Use all of the information to calculate the actual frequency of the C G allel
  12. November 2021, AS Paper 2, Q06.2 (1 mark): Suggest why the scientist took his sample from the population at random. [1 mark]
  13. November 2020, Paper 2, Q06.4 (2 marks): A population of this species of plant contained 9% of red-flowered plants. Use the Hardy–Weinberg equation to calculate the percentage of pink-flowered plants i
  14. June 2019, Paper 2, Q06.5 (2 marks): A population of fruit flies contained 64% grey-bodied flies. Use the Hardy–Weinberg equation to calculate the percentage of flies heterozygous for gene G. [2 ma
  15. June 2018, Paper 2, Q09.2 (2 marks): Use the information provided to explain why the number of people showing LP would rapidly increase once selection for this condition had been established. [2 ma
  16. June 2018, Paper 2, Q10.2 (2 marks): 1 0 Read the following passage. Complete achromatopsia is a form of complete colour blindness. It is caused by having only rods and no functional cone cells. Pe
  17. June 2017, Paper 2, Q07.5 (2 marks): A population of summer squash plants produced only green and yellow fruit. The percentage of plants producing yellow fruit in this population was 36%. Use the H
  18. June 2017, Paper 2, Q09.1 (1 mark): What is a gene pool? [1 mark]
  19. June 2017, Paper 2, Q10.3 (2 marks): 1 0 Alzheimer’s disease (AD) is a non-reversible brain disorder that develops over a number of years. At the start of 2014 the number of Americans with AD was e
  20. Specimen, Paper 2, Q06.1 (2 marks): Frequency of heterozygotes in population in 2003 5

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