O-LevelBiologyGenetics & Variation5090/11 · May/June 2022 · Q381 Mark

Albinism is an inherited condition, caused by a recessive allele. The diagram shows a family tree for a family affected by this condition. [Figure 38.1] Individuals 9 and 11 have albinism. What is the chance that individual 10 is heterozygous?

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A0 in 4

B1 in 4

C2 in 3

D3 in 4

✓ Correct answer

C: 2 in 3

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Topic: Genetics & Variation, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2022 Paper 1 Variant 1, question 38.

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