Difficulty: Medium
Average Score: 64%
Simulated
Passage / Scenario
A pregnant woman whose baby will have Down syndromeWhile talking with a pregnant woman who has undergone genetic testing, the woman informs the nurse that her baby will be born with Down syndrome. The nurse understands that Down syndrome is an example of:
Correct answer
A
Rationale
Down syndrome is caused by trisomy 21, an extra chromosome 21, a numeric abnormality. Multifactorial inheritance involves genes and environment, X-linked affects males primarily, and deletions miss chromosome parts, none fitting Down syndrome.