The newest 6 of 6 written questions. Open one to see it on the real paper.
Determine how many males in the family have beta thalassaemia.
See it on the paper →Fig. 3.1 shows a person with dimples in their cheeks. Dimples are inherited. dimple Fig. 3.1 Dimples are produced when a person has the dominant allele in their genotype. The dominant allele for dimples is D. The allele for not having dimples is d. Two people with dimples have a child without dimples. They are expectin...
See it on the paper →Use Fig. 4.1 to state the number of people: that are homozygous recessive for PKU
See it on the paper →The two people in generation 1 in Fig. 4.1 have the same genotype. State this genotype.
See it on the paper →Albinism is a condition that results in a lack of colour in the skin causing a very pale appearance. The allele for albinism is recessive, a. The allele for no albinism is dominant, A. Fig. 10.1 is a pedigree diagram showing the inheritance of albinism. P Key no albinism albinism male Q female Fig. 10.1 The boxes on th...
See it on the paper →How many cats in the pedigree diagram are heterozygous for fur length?
See it on the paper →Most candidates were able to gain at least one mark even if the genetic diagram was incorrect.
— Examiner report, February/March 2025, 0654/32 Q3(a)(ii) (Cambridge)
Commonly seen incorrect responses included giving the value of 7 instead of 2 for the number of individuals with homozygous recessive genotypes and identifying the number of people with XX chromosomes as 5 instead of 4.
— Examiner report, February/March 2024, 0654/42 Q4(a)(i) (Cambridge)
The correct response was Dd. Heterozygous was an accepted alternative. It was evident that some candidates did not understand the meaning of the term genotype.
— Examiner report, February/March 2024, 0654/42 Q4(a)(ii) (Cambridge)
Past papers, syllabus and examiner reports © UCLES (Cambridge University Press & Assessment). Questions are matched to topics from the official syllabus. AssessPro is independent and not endorsed by Cambridge.