**Core Concept**
Autosomal dominant genes are a type of genetic inheritance pattern where a single copy of the mutated gene is sufficient to cause the disease or trait. This means that only one of the two copies of the gene needs to be affected for the condition to manifest.

**Why the Correct Answer is Right**
In autosomal dominant inheritance, the mutated gene is expressed in every cell of the body because it is located on one of the non-sex chromosomes (autosomes). This leads to the characteristic dominant phenotype, where the affected individual exhibits the trait or disease even if they have a parent who is unaffected. The expression of the mutated gene is not affected by the presence of a normal copy of the gene, hence the dominant pattern.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because autosomal dominant genes are not expressed in a sex-linked manner, which is associated with genes located on the X or Y chromosomes.

**Option B:** This option is incorrect because autosomal dominant genes are not recessive, which would require two copies of the mutated gene to cause the disease or trait.

**Option C:** This option is incorrect because autosomal dominant genes are not linked to the sex chromosomes, which would affect the expression of the gene in a sex-specific manner.

**Clinical Pearl / High-Yield Fact**
It is essential to remember that autosomal dominant conditions often have a high penetrance, meaning that most individuals with the mutated gene will express the trait or disease.

**Correct Answer: D. All cells of the body**