Question

down syndrome has what karyotype?
a xxx
b xxy
c trisomy 21
d none of the above

Explanation:

Down syndrome, also known as trisomy 21, is a genetic disorder caused by the presence of an extra copy of chromosome 21.

• Option a (XXX) is associated with Triple X syndrome.
• Option b (XXY) is related to Klinefelter syndrome.
• Option c (Trisomy 21) is the correct karyotype for Down syndrome.

Answer:

C. Trisomy 21