Exam (elaborations)
OCR A Level Biology B May-June 2024 Question Paper 2 (H422-02)
OCR A Level Biology B May-June 2024 Question Paper 2 (H422-02)
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1 This question is based on the Advance Notice Article ‘The Eye’.
(a) A person’s genotype determines their eye colour phenotype.
(i) Define the term genotype.
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(ii) Define the term phenotype.
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(b) Fig. 1.1 shows the inheritance of eye colour in one family.
Squares represent males and circles represent females.
Filled shapes represent individuals with blue eyes and unfilled shapes represent individuals with
brown eyes.
Fig. 1.1
= male with blue eyes
1 2
= male with brown eyes
= female with blue eyes
3 4 5 = female with brown eyes
6 7 8 9 10
© OCR 2024
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(i) Explain one piece of evidence from Fig. 1.1 that indicates the allele for blue eyes is recessive.
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(ii) Explain one piece of evidence from Fig. 1.1 that indicates the allele for blue eyes is located on
an autosome and not the X chromosome.
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(iii) The chi squared (χ2) test is used to determine whether the results of genetic crosses are
statistically significant.
Explain why the χ2 test is appropriate for use in genetic crosses.
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(iv) Suggest why the χ2 test would not be appropriate for analysing the data in Fig. 1.1.
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© OCR 2024 Turn over
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