What is the most common type of Down syndrome?
A)Anencephaly 12
B)Turner syndrome
C)China syndrome
D)Trisomy 21

Question

Quizplus · Accepted Answer

Trisomy 21 is the most common type of Down syndrome, accounting for about 95% of cases. It is caused by an extra copy of chromosome 21, resulting in a total of 47 chromosomes instead of the usual 46. Anencephaly and Turner syndrome are unrelated genetic disorders. China syndrome is not a recognized medical condition.

What Is the Most Common Type of Down Syndrome