The most common condition of trisomy,in which three copies of a chromosome are present instead of the normal two,is of chromosome
A)X.
B)13.
C)15.
D)18.
E)21.

Question

Quizplus · Accepted Answer

Trisomy 21, also known as Down syndrome, is the most common condition of trisomy in which an extra copy of chromosome 21 is present. Options A through D are incorrect as trisomies of these chromosomes are either incompatible with life or extremely rare.

The Most Common Condition of Trisomy,in Which Three Copies of a Chromosome