Autosomal dominant is –
**Core Concept**
Autosomal dominant is a pattern of inheritance where a single copy of a dominant allele is sufficient to cause the expression of the trait or disease. This means that a person with an autosomal dominant condition has a 50% chance of passing it to each offspring.
**Why the Correct Answer is Right**
In autosomal dominant inheritance, the affected individual has one normal and one mutated allele. The mutated allele is dominant over the normal allele, resulting in the expression of the trait or disease. This is in contrast to autosomal recessive inheritance, where two copies of the mutated allele (one from each parent) are required for the expression of the trait or disease. The affected individual can pass the mutated allele to their offspring, who may be affected or unaffected, depending on the genotype of the other parent.
**Why Each Wrong Option is Incorrect**
**Option A:** Not applicable, as this option is missing.
**Option B:** Not correct, as this is not a definition of autosomal dominant inheritance.
**Option C:** Not correct, as this is not a characteristic of autosomal dominant inheritance.
**Clinical Pearl / High-Yield Fact**
Autosomal dominant conditions often have a high penetrance, meaning that most individuals with the mutated allele will express the trait or disease. However, the expressivity of the condition can vary, and some individuals may be more severely affected than others.
**Correct Answer:** Not provided, as the options were missing. If you provide the options, I can complete the explanation.