Final answer:
The statement regarding Huntington's disease being a sex-linked genetic disorder is false, it is actually an autosomal dominant disorder affecting chromosome 4, with symptoms typically appearing in middle age.
Step-by-step explanation:
Huntington's disease is not sex-linked; rather, it is an autosomal dominant disorder. The disease is caused by a mutation in a gene on an autosome (a non-sex chromosome), specifically chromosome 4. This means that a person only needs to inherit one copy of the mutated gene to exhibit symptoms of the disease.
Symptoms of Huntington's include the breakdown of nerve cells in the brain, which leads to muscle spasms and personality changes. However, these symptoms usually appear in middle age, which can lead to the disorder being passed to children before the parent is aware they have the condition. Individuals with the disease have a 50% chance of passing it on to their offspring, regardless of the child’s sex.