If an individual such as Jenna with Down syndrome has three copies of chromosome 21 , which of the following facts apply to the development of this syndrome?
A. Down syndrome results from nondisjunction in moiosis
B. Down syadrome only results from nondisfunction in meiosis I
C. Down syndrarne only results from nondigfunction in mososis if fither the ogg or the sperm that produced an indlvidual with
D. Down syndrome was missing a copy of chromosome 21 ( n - 1 )