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LemyLekySama LemyLekySama
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Posts: 36
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11 years ago
Huntington disease is governed by autosomal dominant inheritance. What is the likelihood that a person who has one heterozygous affected parent and one normal parent will develop the disease?

 a) 50%
 b) 75%
 c) 0% (impossible)
 d) 100% (certain)
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wrote...
11 years ago
50%
wrote...
11 years ago
a) 50 %

Because a child receives one gene from each parent. The heterozygous affected parent has one normal gene and one affected gene. This parent must give one of the two to his/her child, therefore, the probability is 50%.
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