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The roles of genes in determining the phenotype: CAIE A‑Level Biology questions

Every CAIE A-Level Biology exam question on 16.2 The roles of genes in determining the phenotype, June 2024 and the specimen papers, with its mark scheme and examiner’s report.

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240 questions

  1. Q6(a)(ii)

    June 2024 · Paper 4

    3 marks16.2 The roles of genes in determining the phenotype
    The whole paper ↗
    June 2024 Paper 4, question 6(a)(ii): Albinism in humans can be caused by recessive mutations of the TYR gene. Explain why a person who is homozygous recessive for the TYR gene shows albinism. [3]

  2. Q6(b)

    June 2024 · Paper 4

    4 marks16.2 The roles of genes in determining the phenotype
    The whole paper ↗
    June 2024 Paper 4, question 6(b): Fur colour in rabbits involves a number of different genes. Some of these genes interact. Gene 1 has two alleles, B and b. • The dominant allele, B, results in

  3. Q6(b)(i)

    Specimen · Paper 4

    2 marks16.2 The roles of genes in determining the phenotype
    The whole paper ↗
    Specimen Paper 4, question 6(b)(i): Explain what is meant by the terms recessive and allele. recessive allele [2]

  4. Q6(b)(ii)

    Specimen · Paper 4

    3 marks16.2 The roles of genes in determining the phenotype
    The whole paper ↗
    Specimen Paper 4, question 6(b)(ii): Construct a genetic diagram to show how a man and a woman, who both produce melanin, could have a child with albinism. Use appropriate symbols in your answer an
All 4 questions on The roles of genes in determining the phenotype, as a list
  1. June 2024, Paper 4, Q6(a)(ii) (3 marks): Albinism in humans can be caused by recessive mutations of the TYR gene. Explain why a person who is homozygous recessive for the TYR gene shows albinism. [3]
  2. June 2024, Paper 4, Q6(b) (4 marks): Fur colour in rabbits involves a number of different genes. Some of these genes interact. Gene 1 has two alleles, B and b. • The dominant allele, B, results in
  3. Specimen, Paper 4, Q6(b)(i) (2 marks): Explain what is meant by the terms recessive and allele. recessive allele [2]
  4. Specimen, Paper 4, Q6(b)(ii) (3 marks): Construct a genetic diagram to show how a man and a woman, who both produce melanin, could have a child with albinism. Use appropriate symbols in your answer an

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