0654.B16.3.10 — Interpret pedigree diagrams for the inheritance of a given characteristic: past paper questions
Real questions on 0654.b16.3.10 — interpret pedigree diagrams for the inheritance of a given characteristic
The newest 5 of 5 written questions. Open one to see it on the real paper.
- 0973/41 · October/November 2023 · Q1a(i)[2]
Use Fig. 1.1 to state: the number of people with the genotype aa the number of people with the sex chromosomes XY.
See it on the paper → - 0973/41 · May/June 2022 · Q4a(i)[1]
State the number of males in Fig. 4.1 that are unaffected by Tay-Sachs disease.
See it on the paper → - 0973/41 · May/June 2022 · Q4a(ii)[4]
Complete the sentences to explain the genotypes of some of the people in Fig. 4.1. Person E and person F are by Tay-Sachs disease. Person E and person F both have the genotype . Person G has Tay-Sachs disease. They have the genotype .
See it on the paper → - 0973/41 · May/June 2020 · Q4a(i)[1]
State the total number of people that are carriers of cystic fibrosis in Fig. 4.1.
See it on the paper → - 0973/41 · May/June 2020 · Q4a(ii)[1]
Identify the letter of one person who has cystic fibrosis.
See it on the paper →
What examiners said
Most candidates gained the first mark for identifying the number of people with the genotype aa. The number of people with the sex chromosomes XY was more challenging, with many candidates giving the answer 1, 3 or 5.
— Examiner report, October/November 2023, 0973/41 Q1(a)(i) (Cambridge)
Almost all candidates used the key correctly to give an answer of 4.
— Examiner report, May/June 2022, 0973/41 Q4(a)(i) (Cambridge)
While the majority of candidates gained marking points 1 and 4, many candidates did not realise that genotypes need to have both alleles included. Responses of t and T were commonly seen in the second and third sentences.
— Examiner report, May/June 2022, 0973/41 Q4(a)(ii) (Cambridge)
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