O-LevelBiologyGenetics & Variation5090/12 · Oct/Nov 2018 · Q391 Mark
The diagram shows a family in which some members suffer from a disease caused by a recessive allele. [Figure 39.1] Which are two members of the family who must be heterozygous for the gene?
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A5 and 7
B3 and 6
C2 and 5
D1 and 4
✓ Correct answer
A: 5 and 7
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