plumiInheritance and genetic diagrams: Edexcel GCSE Combined Science questions
Every Edexcel GCSE Combined Science exam question on Inheritance and genetic diagrams (specification points 3.12–3.16), 2018–2025, with its mark scheme and examiner’s report.
Paper
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Calculations
Q6(a)(i)
The whole paper ↗Your answerQ6(a)(ii)
The whole paper ↗Q6(b)
The whole paper ↗Q4(c)
The whole paper ↗Q4(a)
The whole paper ↗Your answerQ4(b)(i)
The whole paper ↗Q4(b)(ii)
The whole paper ↗Q4(c)(i)
The whole paper ↗Q4(c)(ii)
The whole paper ↗Q5(a)(ii)
The whole paper ↗Your answerQ3(c)(ii)
The whole paper ↗Q3(c)(iii)
The whole paper ↗Q4(b)(ii)
The whole paper ↗Q2(a)(i)
The whole paper ↗Q2(a)(ii)
The whole paper ↗Q2(a)(iii)
The whole paper ↗Q3(a)
The whole paper ↗Your answerQ4(a)(ii)
The whole paper ↗Q4(a)(iii)
The whole paper ↗Q4(a)(iv)
The whole paper ↗
All 20 questions on Inheritance and genetic diagrams, as a list
- June 2025, Biology Paper 1 Higher, Q6(a)(i) (1 mark): Which row is correct for the mother, father and son? (1) mother father son A affected unaffected carrier B carrier affected affected C carrier affected carrier
- June 2025, Biology Paper 1 Higher, Q6(a)(ii) (2 marks): Cystic fibrosis causes the build‑up of thick, sticky mucus. Describe how the build-up of thick, sticky mucus affects the airways of a person. (2)
- June 2025, Biology Paper 1 Higher, Q6(b) (4 marks): Huntington’s disease is a condition caused by a dominant allele. Explain the phenotypes of the offspring of a genetic cross between a person who is heterozygous
- June 2023, Biology Paper 1 Higher, Q4(c) (2 marks): Sex determination in birds is different from humans. Males are homozygous Z and females are heterozygous ZW. Complete the Punnett square to show how sex is dete
- June 2023, Biology Paper 1 Foundation, Q4(a) (1 mark): Which term describes the allele for white flowers? (1) A heterozygous B homozygous C gamete D recessive
- June 2023, Biology Paper 1 Foundation, Q4(b)(i) (2 marks): Complete the Punnett square. (2) wrinkled seeds R round seeds r
- June 2023, Biology Paper 1 Foundation, Q4(b)(ii) (1 mark): State the percentage of the offspring that will produce round seeds. (1) percentage = %
- June 2023, Biology Paper 1 Foundation, Q4(c)(i) (2 marks): Calculate the ratio of offspring with purple flowers to offspring with white flowers. Give your answer to the nearest whole number. (2) ratio : 1
- June 2023, Biology Paper 1 Foundation, Q4(c)(ii) (2 marks): Explain why it was possible for this cross to produce some offspring with white flowers. (2)
- June 2023, Biology Paper 1 Foundation, Q5(a)(ii) (1 mark): The colour of an apple is an observable characteristic. Which is the term for an observable characteristic? (1) A gene B genotype C heterozygous D phenotype
- June 2022, Biology Paper 1 Foundation, Q3(c)(ii) (2 marks): Figure 6 shows the inheritance of cystic fibrosis in a family. F represents the dominant allele that does not cause cystic fibrosis. f represents the recessive
- June 2022, Biology Paper 1 Foundation, Q3(c)(iii) (1 mark): State the genotype of person C. (1)
- November 2021, Biology Paper 1 Higher, Q4(b)(ii) (3 marks): Haemochromatosis can be inherited. Haemochromatosis occurs when a person inherits two copies of a recessive allele. Figure 6 shows the inheritance of haemochrom
- November 2021, Biology Paper 1 Foundation, Q2(a)(i) (1 mark): Two parents are heterozygous for sickle cell disease. Complete the Punnett square to show the possible genotypes of their children. (1) D d D d
- November 2021, Biology Paper 1 Foundation, Q2(a)(ii) (1 mark): State the percentage probability that their children could have sickle cell disease. (1) percentage probability = %
- November 2021, Biology Paper 1 Foundation, Q2(a)(iii) (2 marks): A father with the genotype dd and a mother with the genotype DD plan to have several children. Explain why none of their children will have sickle cell disease.
- November 2021, Biology Paper 1 Foundation, Q3(a) (1 mark): Carrots have different physical characteristics such as colour. Which genetic term describes the physical characteristics of a carrot? (1) A genotype B monohybr
- June 2019, Biology Paper 1 Foundation, Q4(a)(ii) (1 mark): State the gender shown by this karyogram. (1)
- June 2019, Biology Paper 1 Foundation, Q4(a)(iii) (2 marks): Complete the Punnett square to show how gender is inherited. (2) male gametes female gametes
- June 2019, Biology Paper 1 Foundation, Q4(a)(iv) (1 mark): State the probability that a child will be male. (1)
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