O-LevelBiologyGenetics & Variation5090/12 · May/June 2022 · Q381 Mark
The diagram shows a family tree for the inheritance of eye colour. The allele for brown eyes is dominant and the allele for blue eyes is recessive. Which people must be heterozygous for eye colour?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
A1, 3 and 7
B2 and 6
C3, 4 and 5
D4 and 5 only
✓ Correct answer
C: 3, 4 and 5
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