**Core Concept**
Autosomal dominant is a type of inheritance pattern where a single copy of a dominant allele is sufficient to cause the expression of a particular trait or disease. This pattern of inheritance follows a predictable ratio, with each offspring having a 50% chance of inheriting the dominant allele.

**Why the Correct Answer is Right**
In autosomal dominant conditions, the dominant allele is expressed even if the individual is heterozygous for the gene. This means that a single copy of the dominant allele is enough to cause the disease or trait, whereas two copies of the recessive allele are required for the condition to be expressed. The pattern of inheritance is characterized by a 50% chance of transmission to each offspring.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to the question.
**Option B:** This option is incorrect as it doesn't describe the correct inheritance pattern.
**Option C:** This option is incorrect as it doesn't accurately describe the characteristics of autosomal dominant inheritance.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that autosomal dominant conditions often have a high penetrance, meaning that most individuals who inherit the dominant allele will express the trait or disease. This is in contrast to autosomal recessive conditions, where two copies of the recessive allele are required for the condition to be expressed.

**Correct Answer: C. Inheritance pattern where a single copy of the dominant allele is sufficient to cause the expression of a particular trait or disease.**