Which of the following genetic disorders is caused by a dominant allele but does not produce symptoms until the affected individual is well into adulthood?

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Huntington disease is caused by a dominant allele, meaning an individual only needs one copy of the allele to be affected. However, symptoms typically do not appear until the affected individual is in their 30s to 40s. This is because the disease affects the nervous system and causes degeneration over time. Turner syndrome is caused by a missing or incomplete X chromosome in females and does not involve a dominant allele. Down syndrome is caused by an extra copy of chromosome 21 and does not involve a dominant allele. Sickle-cell anemia is caused by a recessive allele, meaning an affected individual must have two copies of the allele. Hemophilia is caused by a recessive allele and does not involve a dominant allele.

Which of the Following Genetic Disorders Is Caused by a Dominant