Albinism is an inherited condition, caused by a recessive allele.
The diagram shows a family tree for a family affected by this condition.
Individuals 9 and 11 have albinism.
What is the chance that individual 10 is heterozygous?
1 )
0 in 4
2 )
1 in 4
2 in 3
4 )
3 in 4
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