plumiHow is genetic information inherited?: OCR GCSE Combined Science B questions
Every OCR GCSE Combined Science B exam question on B1.2 How is genetic information inherited?, 2018–2025, with its mark scheme and examiner’s report.
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Calculations
Q6(a)(i)
The whole paper ↗Q6(a)(ii)
The whole paper ↗Q6(a)(iii)
The whole paper ↗Q6(a)(iv)
The whole paper ↗Q5(a)(i)
The whole paper ↗Q5(a)(ii)
The whole paper ↗Q5(a)(iii)
The whole paper ↗Q5(a)(iv)
The whole paper ↗Q5(a)
The whole paper ↗
Q5(b)
The whole paper ↗Q9(b)
The whole paper ↗
Q9(c)
The whole paper ↗Q10(b)(i)
The whole paper ↗
Q10(b)(ii)
The whole paper ↗Q10(c)
The whole paper ↗Q1(b)(i)
The whole paper ↗
Q1(b)(ii)
The whole paper ↗Q1(c)
The whole paper ↗Q4(a)
The whole paper ↗
Q4(b)
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All 41 questions on How is genetic information inherited?, as a list
- June 2025, Biology Paper 1 Foundation, Q6(a)(i) (2 marks): Parent A has the disease and parent B is a carrier. Complete the Punnett square to show the possible alleles of their offspring. Use: • T to represent a normal
- June 2025, Biology Paper 1 Foundation, Q6(a)(ii) (2 marks): Calculate the expected ratio of children with Tay-Sachs disease to children without the disease for these parents. Give your answer in its simplest form. Ratio
- June 2025, Biology Paper 1 Foundation, Q6(a)(iii) (1 mark): Calculate the probability that these parents will have a child with Tay-Sachs disease. Probability = [1]
- June 2025, Biology Paper 1 Foundation, Q6(a)(iv) (1 mark): How would you describe the genotype of a person with Tay-Sachs disease? Tick (✓) one box. Heterozygous dominant Heterozygous recessive Homozygous dominant Homoz
- June 2025, Biology Paper 5 Higher, Q5(a)(i) (1 mark): Explain the term recessive. [1]
- June 2025, Biology Paper 5 Higher, Q5(a)(ii) (2 marks): Complete the Punnett square to show how Tay-Sachs disease may be inherited when both parents are heterozygous. Use: • T to represent a normal allele • t to repr
- June 2025, Biology Paper 5 Higher, Q5(a)(iii) (1 mark): Which offspring would have Tay-Sachs disease? Put a ring around the correct option in the Punnett square. [1]
- June 2025, Biology Paper 5 Higher, Q5(a)(iv) (1 mark): Write down the expected ratio of children without Tay-Sachs disease to children with the disease for these parents. Ratio = : [1]
- June 2024, Combined Science Paper 8 Higher, Q5(a) (2 marks): Complete the Punnett square to show the possible genotypes when Mendel crossed homozygous tall pea plants with homozygous short pea plants. The dominant allele
- June 2024, Combined Science Paper 8 Higher, Q5(b) (2 marks): A student makes a statement about the genetic cross: “If 100 pea plants were produced from this cross, then 50 of them should be tall pea plants.” Explain why t
- June 2023, Biology Paper 1 Foundation, Q9(b) (4 marks): Scientists have different terms for different parts of the genome. Draw lines to connect each term with its correct explanation. Term Explanation A dominant or
- June 2023, Biology Paper 1 Foundation, Q9(c) (2 marks): A scientist says: Your phenotype is affected by your genotype. Explain the terms phenotype and genotype. Phenotype Genotype [2]
- June 2023, Biology Paper 1 Foundation, Q10(b)(i) (1 mark): What is the probability that a fertilised egg will have the chromosomes XY? Put a ring around the correct answer. 0 0.5 1 2 [1]
- June 2023, Biology Paper 1 Foundation, Q10(b)(ii) (1 mark): What is the expected ratio of XX to XY offspring? Ratio = : [1]
- June 2023, Biology Paper 1 Foundation, Q10(c) (2 marks): Describe how inheriting a Y chromosome causes the baby to be born with male characteristics. [2]
- June 2023, Biology Paper 5 Higher, Q1(b)(i) (1 mark): What is the probability that a fertilised egg will have the chromosomes XY? Put a ring around the correct answer. 0 0.5 1 2 [1]
- June 2023, Biology Paper 5 Higher, Q1(b)(ii) (1 mark): What is the expected ratio of XX to XY offspring? Ratio = : [1]
- June 2023, Biology Paper 5 Higher, Q1(c) (2 marks): Describe how inheriting a Y chromosome causes the baby to be born with male characteristics. [2]
- June 2022, Combined Science Paper 4 Foundation, Q4(a) (3 marks): Draw one line from each genetic term to its correct definition. Genetic Term Definition Only one copy of this genetic variant is Alleles needed to have the feat
- June 2022, Combined Science Paper 4 Foundation, Q4(b) (6 marks): This question is about genes and inheritance. (b)* Sara breeds rats. Some rats have an inherited genetic condition that means they lack pigment in their skin an
- June 2022, Combined Science Paper 8 Higher, Q3(b) (3 marks): Meiosis is another form of cell division. Complete the sentences to explain the role of meiosis. Use the words and numbers. You can use each word and each numbe
- June 2022, Combined Science Paper 8 Higher, Q7(a)(i) (2 marks): There were 1212 women in the Australian study. Calculate the number of women with BRCA alleles in the Australian study who developed breast cancer. Use the data
- June 2022, Combined Science Paper 8 Higher, Q7(a)(ii) (1 mark): Which country has the highest proportion of women with cancer in the study? [1]
- June 2022, Combined Science Paper 8 Higher, Q7(a)(iii) (3 marks): A student looks at the data and draws the conclusion that roughly the same percentage of women have the BRCA1 allele as those who have the BRCA2 allele. Explain
- November 2021, Biology Paper 1 Foundation, Q8(a) (2 marks): The alleles for the mutated gene are: F = dominant allele f = recessive allele. The genotype of a person who has cystic fibrosis is ff. Write down the two possi
- November 2021, Biology Paper 1 Foundation, Q8(b) (2 marks): Complete each sentence about mutations. Use the words. You can use each word once, more than once, or not at all. caught genotype inherited phenotype Genetic va
- November 2021, Biology Paper 5 Higher, Q7(b)(i) (2 marks): Calculate the probabilities of having: • a child with haemophilia • a female child with haemophilia • a male child with haemophilia [2]
- November 2021, Biology Paper 5 Higher, Q7(b)(ii) (4 marks): Write down an example of a homozygous and heterozygous offspring from the Punnet square. Explain your answers. Homozygous offspring: Heterozygous offspring: [4]
- November 2021, Biology Paper 5 Higher, Q7(b)(iii) (2 marks): How is a gamete represented in the Punnett square? Put a ring around the correct answer. XH XHXh XHY XY Give one reason for your answer. [2]
- November 2021, Biology Paper 5 Higher, Q7(c) (2 marks): Eye colour, like haemophilia, is only determined by genes. Suggest two reasons why there are so many different eye colours. 1 2 [2]
- November 2020, Biology Paper 1 Foundation, Q4(b)(i) (1 mark): The dominant allele for coat colour is black. Write down the genotype of a homozygous red cow and a homozygous black bull. Use B to represent the black allele a
- November 2020, Biology Paper 1 Foundation, Q4(b)(ii) (3 marks): When a homozygous red cow and a homozygous black bull (first generation) are mated all of the offspring (second generation) are black with the genotype Bb. If t
- November 2020, Biology Paper 5 Higher, Q7(a) (4 marks): When a roan shorthorn cow and a roan shorthorn bull are mated a mixture of white, red and roan offspring are produced The farmer counts 23 white, 28 red and 52
- November 2020, Biology Paper 5 Higher, Q7(b) (6 marks): Coat colour in shorthorn cattle (bulls and cows) is controlled by two alleles, red, R, and white, W. The alleles that control coat colour are codominant. This m
- June 2019, Biology Paper 1 Foundation, Q3(a)(i) (2 marks): Two parents do not have sickle cell disease. These parents can have a child that does have sickle cell disease. Complete the Punnett square in Fig. 3.1 to expla
- June 2019, Biology Paper 1 Foundation, Q3(a)(ii) (1 mark): Put a ring around the heterozygous fertilised eggs in the Punnett square in Fig. 3.1. [1]
- June 2019, Biology Paper 1 Foundation, Q3(a)(iii) (1 mark): What is the probability that these parents in Fig. 3.1 will have a child that has sickle cell disease? Tick (✓) one box. 0.25 0.5 0.75 1 [1]
- June 2019, Biology Paper 5 Higher, Q4(a)(i) (3 marks): A person will have Huntington’s disease if they inherit a faulty allele from one parent or from both parents. Complete the Punnett square to show how Huntington
- June 2019, Biology Paper 5 Higher, Q4(a)(ii) (1 mark): Write down the expected percentage of Huntington’s disease phenotypes. Percentage = % [1]
- June 2018, Biology Paper 1 Foundation, Q9(a) (5 marks): Use your knowledge of how human sex is determined to explain why having only males is very unusual. Use the Punnett square in your answer. [5]
- June 2018, Biology Paper 5 Higher, Q1(a) (5 marks): Use your knowledge of how human sex is determined to explain why having only males is very unusual. Use the Punnett square in your answer. [5]
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