A 43-year-old pregnant woman asks the nurse how to find out if the baby will be born with Down syndrome. Which statement made by the nurse would be an appropriate response?

Question

Quizplus · Accepted Answer

Down syndrome is caused by an extra copy of chromosome 21, which results in 47 chromosomes instead of the usual 46. Therefore, option A is the correct answer. Option B is incorrect because all humans have 23 pairs of chromosomes, and Down syndrome does not affect the number of pairs. Option C is incorrect because a missing chromosome is associated with a different condition called Turner syndrome. Option D is incorrect because Down syndrome does not involve a sex chromosome abnormality.

A 43-Year-Old Pregnant Woman Asks the Nurse How to Find