Why Does Huntington's Disease Have a Heritability Ratio of 1

question 48

Multiple Choice

Why does Huntington's disease have a heritability ratio of 1.0?

• A) The gene that causes Huntington's disease is dominant.
• B) In families where Huntington's disease is prevalent, it tends to appear at least once every generation.
• C) If someone inherits the gene for Huntington's disease, it is inevitable that he/she will acquire the disease.
• D) Because of environmental influences, it is difficult to predict whether someone will acquire the disease despite having the diseased allele.

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