Which of the following is an example of a single-gene disorder that is dominant?

Question

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Huntington disease is a single-gene disorder that is dominant, meaning that if an individual inherits one copy of the abnormal gene, they will develop the disease. Down syndrome is a chromosomal disorder, not a single-gene disorder, and it is caused by an extra copy of chromosome 21. Nearsightedness is a complex disorder that can be influenced by multiple genes as well as environmental factors. Fragile X syndrome is a single-gene disorder, but it is an example of a disorder that is caused by a recessive mutation, meaning that an individual must inherit two copies of the abnormal gene in order to develop the disorder.

Which of the Following Is an Example of a Single-Gene