HESI PN Exit Exam 2024 Related

Review HESI PN Exit Exam 2024 related questions and content

What is the most common genetic cause of intellectual disability?

  • A. Down syndrome
  • B. Fragile X syndrome
  • C. Prader-Willi syndrome
  • D. Turner syndrome
Correct Answer: B

Rationale: The correct answer is Fragile X syndrome because it is the most common inherited cause of intellectual disability, resulting from a mutation in the FMR1 gene. Down syndrome, Prader-Willi syndrome, and Turner syndrome are not the most common genetic causes of intellectual disability. Down syndrome is caused by the presence of an extra chromosome 21, Prader-Willi syndrome results from specific genetic abnormalities on chromosome 15, and Turner syndrome is characterized by the absence of part or all of one of the X chromosomes.