plumiGenetic terms and monohybrid inheritance: Edexcel International A Level Biology questions
Edexcel International A Level Biology past-paper questions on 2.6.2 Genetic terms and monohybrid inheritance, 2019–2025, with mark schemes and examiner’s reports where available.
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Q8(b)
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All 32 questions on Genetic terms and monohybrid inheritance, as a list
- January 2025, AS Unit 1, Q8(b) (4 marks): In most types of OI the allele responsible for causing the condition is dominant. Determine the probability that a child could inherit OI if one parent has OI a
- October 2024, AS Unit 1, Q3(a)(i) (1 mark): Which row of the table shows the genotype and phenotype for individual 1? (1) genotype phenotype A CC unaffected homozygous B Cc unaffected heterozygous C unaff
- October 2024, AS Unit 1, Q3(a)(ii) (1 mark): Which allele combinations could individual 3 have? (1) A CC only B cc only C CC or cc D CC or Cc
- October 2024, AS Unit 1, Q3(a)(iii) (1 mark): What is the probability that a fourth child would be a female with CMT? (1) A 1 in 2 B 1 in 4 C 1 in 8 D 1 in 16
- October 2024, AS Unit 1, Q3(b)(i) (1 mark): In the USA, 5% of people with CMT have one of these dominant forms of the disease. In the USA, there are a total of 126 000 people with all forms of CMT. Calcul
- October 2024, AS Unit 1, Q3(b)(ii) (3 marks): An individual with a dominant form of CMT will have the allele combination TT or Tt. Draw a genetic diagram to show the possible allele combinations of the chil
- June 2023, AS Unit 1, Q7(a) (4 marks): Phenylketonuria (PKU) is one genetic disorder that is screened for by prenatal testing. This disorder is inherited in a similar way to cystic fibrosis. Explain
- June 2023, AS Unit 2, Q2(a) (1 mark): There is more than one version of each of the genes involved. Which term is used for different versions of a gene? (1) A allele B locus C phenotype D polygenic
- January 2023, AS Unit 1, Q8(a) (2 marks): Explain why the inheritance of blood type, shown in this diagram, is an example of codominance. (2)
- January 2023, AS Unit 1, Q8(b) (4 marks): Determine the ratio of the possible blood type phenotypes of the children of individuals 3 and 4. You must draw a genetic diagram. (4) Genetic diagram: Ratio
- January 2023, AS Unit 1, Q8(c)(i) (3 marks): Explain how the alleles present in individual 3 result in the proteins found on the surfaces of his red blood cells. (3)
- October 2022, AS Unit 2, Q5(a)(i) (1 mark): State what is meant by the term allele. (1)
- October 2022, AS Unit 2, Q5(a)(ii) (1 mark): Which of the following is the genotype of a person who is Rhesus negative for all three genes? (1) A ccddee B ccddEe C CcDdEe D CCDDEE
- June 2022, AS Unit 1, Q8(c)(i) (1 mark): What is the probability of couple 1 and 2 having a fourth child that is a male affected by PKU? (1) A 0.000 B 0.125 C 0.250 D 0.500
- June 2022, AS Unit 1, Q8(c)(ii) (6 marks): Discuss the extent to which this pedigree diagram can be used to identify the genotypes of all the members of this family. (6)
- October 2021, AS Unit 1, Q8(a)(i) (3 marks): Gene and allele (3)
- October 2021, AS Unit 1, Q8(a)(ii) (3 marks): Genotype and phenotype (3)
- October 2021, AS Unit 1, Q8(b) (3 marks): A black chicken was mated with a speckled chicken. They had 25 chicks. Determine the expected number of speckled chicks. You must use a genetic diagram. (3) Ans
- October 2021, AS Unit 1, Q8(c)(i) (1 mark): Name the statistics test being used to analyse these data. (1)
- October 2021, AS Unit 1, Q8(c)(ii) (2 marks): Complete this table to show the missing values. (2)
- October 2021, AS Unit 1, Q8(c)(iii) (1 mark): Calculate E (1) Answer
- June 2021, AS Unit 1, Q4(a) (1 mark): Complete the diagram to show the following information: (1) • individual 7 as a male taster • individual 8 as a male non‑taster • individual 9 as a female taste
- June 2021, AS Unit 1, Q4(b)(i) (2 marks): Gene and allele (2)
- June 2021, AS Unit 1, Q4(b)(ii) (2 marks): Genotype and phenotype (2)
- June 2021, AS Unit 1, Q4(c) (2 marks): Explain which is the dominant allele. Use the information in the pedigree diagram to support your answer. (2)
- January 2021, AS Unit 1, Q3(b)(i) (2 marks): Between one in 20 000 and one in 25 000 babies are born with GSD. About 25% of patients with GSD are thought to have Von Gierke disease. In one country, 3.8 mil
- January 2021, AS Unit 1, Q3(b)(ii) (2 marks): Von Gierke disease is an inherited disease. Suggest why the majority of these babies are born to parents who are not affected by Von Gierke disease. (2)
- October 2020, AS Unit 1, Q2(a) (1 mark): The phenotype is affected by the genotype. State what is meant by the term genotype. (1)
- October 2020, AS Unit 1, Q2(b) (1 mark): State the probability that the next tiger born to these two parents will be female. (1)
- October 2020, AS Unit 1, Q2(c) (3 marks): Determine the expected phenotypic ratio of orange tigers to white tigers born to the parents shown in this pedigree diagram. Use a genetic diagram to support yo
- October 2020, AS Unit 1, Q2(d) (1 mark): The incidence of white tigers in the wild is 1 in 10 000 Bengal tigers. There are approximately 6000 Bengal tigers in captivity, 200 of which are white. Calcula
- October 2020, Unit 5, Q8(a) (2 marks): Explain what is meant by the phrase ‘gene variants’ (paragraph 4). (2)
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