Which of the following has autosomal dominant inheritance –
**Core Concept**
Autosomal dominant inheritance refers to a pattern of inheritance where a single copy of the mutated gene is sufficient to cause the condition, and each child of an affected parent has a 50% chance of inheriting the mutated gene. This contrasts with autosomal recessive inheritance, where two copies of the mutated gene are required to cause the condition.
**Why the Correct Answer is Right**
The key characteristic of autosomal dominant inheritance is that a single copy of the mutated gene is sufficient to cause the condition. This is because the mutated gene is located on one of the 22 non-sex chromosomes (autosomes), and only one copy of the mutated gene is needed to disrupt the normal function of the gene. Examples of autosomal dominant conditions include neurofibromatosis type 1 and achondroplasia.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is not specified, and without more information, it is impossible to determine whether it has autosomal dominant inheritance.
**Option B:** This option is incorrect because it is not a condition, but rather a type of inheritance pattern (X-linked dominant).
**Option C:** This option is incorrect because it is not a condition, but rather a type of inheritance pattern (autosomal recessive).
**Option D:** This option is incorrect because it is not a condition, but rather a type of inheritance pattern (mitochondrial inheritance).
**Clinical Pearl / High-Yield Fact**
When considering a condition with autosomal dominant inheritance, it is essential to remember that each child of an affected parent has a 50% chance of inheriting the mutated gene. This is in contrast to autosomal recessive inheritance, where each child has a 25% chance of inheriting two copies of the mutated gene.
**Correct Answer:** (This section is incomplete as the options are missing)