## **Core Concept**
Autosomal dominant genetic disorders are conditions caused by a mutation in one of the two copies of a gene located on an autosome (not a sex chromosome). This single copy of the mutated gene is enough to cause the disorder. The disorders are characterized by a dominant pattern of inheritance, meaning a single copy of the dominant allele is sufficient to cause the condition.

## **Why the Correct Answer is Right**
The correct answer, , represents an autosomal dominant disorder. In autosomal dominant conditions, an affected parent has a 50% chance of passing the mutated gene to each offspring. The disorders are often characterized by variable expressivity and penetrance. Examples of classic autosomal dominant disorders include Huntington's disease, Marfan syndrome, and neurofibromatosis type 1.

## **Why Each Wrong Option is Incorrect**
* **Option A:** - This option does not represent an autosomal dominant pattern of inheritance. Without specifics, we can infer based on common genetic disorders that many are not autosomal dominant.
* **Option B:** - Similarly, this option does not represent an autosomal dominant disorder. The specifics would determine its mode of inheritance, but it's incorrect based on the question.
* **Option C:** - This is also not an autosomal dominant disorder. The mode of inheritance for this option does not align with autosomal dominant characteristics.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that autosomal dominant disorders often present with a family history of the condition. If a patient presents with a condition known to be autosomal dominant, it's crucial to consider screening family members, especially first-degree relatives.

## **Correct Answer:** .