The most common extra-chromosome condition is _____.
A) Down syndrome
B) nearsightedness
C) fragile X syndrome
D) Turner syndrome

Question

Quizplus · Accepted Answer

Down syndrome is the most common extra-chromosome condition, occurring in about 1 in every 700 births. Nearsightedness and fragile X syndrome are genetic conditions, but not necessarily caused by an extra chromosome. Turner syndrome involves a missing or partially missing X chromosome, rather than an extra chromosome.

The Most Common Extra-Chromosome Condition Is _____