Which one of the following is not autosomal recessive?
**Core Concept**
The question requires identifying the disorder that does not follow an autosomal recessive inheritance pattern. Autosomal recessive disorders are characterized by the need for two copies of the mutated gene (one from each parent) to manifest the condition. These disorders are typically seen in individuals who are homozygous recessive for the mutated gene.
**Why the Correct Answer is Right**
Autosomal dominant disorders, on the other hand, require only one copy of the mutated gene to manifest the condition. The affected individual can be either homozygous dominant or heterozygous for the mutated gene. The most common example of an autosomal dominant disorder is Huntington's disease, which is caused by a mutation in the Huntingtin gene. This disorder is characterized by progressive damage to the brain, leading to motor, cognitive, and psychiatric symptoms.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided, so we can't evaluate it.
**Option B:** This option is not provided, so we can't evaluate it.
**Option C:** This option is not provided, so we can't evaluate it.
**Option D:** This option is not provided, so we can't evaluate it.
**Clinical Pearl / High-Yield Fact**
Autosomal dominant disorders often have a family history of the condition, as each affected individual can pass the mutated gene to their offspring. It's essential to take a detailed family history when evaluating patients for genetic disorders.
**Correct Answer:** .