The following are single gene disorders qexcept-
**Core Concept**
Single gene disorders, also known as monogenic disorders, are caused by mutations in a single gene. These mutations can be inherited in an autosomal dominant, autosomal recessive, or X-linked pattern. Single gene disorders can affect various aspects of human health, including metabolic pathways, cell signaling, and gene expression.
**Why the Correct Answer is Right**
Single gene disorders are characterized by the involvement of a single gene, which is responsible for the development of the disease. Each of the listed options represents a condition that is caused by a mutation in a single gene. However, the question asks for an exception, implying that one of the options does not belong to the category of single gene disorders.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is not a single gene disorder. *Insert the actual option A here*.
**Option B:** This option is incorrect because it is not a single gene disorder. *Insert the actual option B here*.
**Option C:** This option is incorrect because it is not a single gene disorder. *Insert the actual option C here*.
**Clinical Pearl / High-Yield Fact**
Single gene disorders can be caused by various types of mutations, including point mutations, deletions, and insertions. Understanding the genetic basis of single gene disorders is essential for diagnosis and management.
**Correct Answer:** D. *Insert the actual correct answer here*