## **Core Concept**
Autosomal recessive diseases are genetic disorders caused by mutations in genes located on autosomes (non-sex chromosomes) that require an individual to inherit two copies of the mutated gene (one from each parent) to express the condition. Carriers of autosomal recessive diseases, who have one normal and one mutated gene, typically do not display symptoms but can pass the mutated gene to their offspring.

## **Why the Correct Answer is Right**
The correct answer, , is an example of an autosomal dominant condition, not an autosomal recessive one. Autosomal dominant diseases only require one copy of the mutated gene to express the condition, and each child of an affected parent has a 50% chance of inheriting the mutated gene.

## **Why Each Wrong Option is Incorrect**
* **Option A:** - This option represents an autosomal recessive condition. Conditions like sickle cell anemia and cystic fibrosis are classic examples of autosomal recessive diseases.
* **Option B:** - This is also an example of an autosomal recessive condition. These diseases follow the pattern of inheritance characteristic of autosomal recessive disorders.
* **Option D:** - Another autosomal recessive condition. These types of diseases will only manifest if an individual is homozygous recessive for the gene.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that for autosomal recessive diseases, **carriers are usually asymptomatic but can pass the mutated gene to their offspring**. This is crucial for genetic counseling, especially in families with a history of such diseases.

## **Correct Answer: .**