A pregnant woman who has undergone genetic testing informs the nurse that her fetus has Down syndrome. The nurse understands that Down syndrome is an example of:

Question

A) Multifactorial inheritance
B) X-linked recessive inheritance
C) Trisomy numeric abnormality
D) Chromosomal deletion

Answer 1

C
Response:
Down syndrome is an example of a chromosomal abnormality involving the number of chromosomes: the individual has three copies of chromosome 21 . Multifactorial inheritance gives rise to disorders such as cleft lip, congenital heart disease, neural tube defects, and pyloric stenosis. X-linked recessive inheritance is associated with disorders such as hemophilia. Chromosomal deletion is involved with disorders such as cri-du-chat syndrome.