The MOST common extra-chromosome condition is:

A) Down syndrome.
B) nearsightedness.
C) fragile X syndrome.
D) Tourette syndrome.

Question

The MOST common extra-chromosome condition is:A)  Down syndrome.B)  nearsightedness.C)  fragile X syndrome.D)  Tourette syndrome.

Kasey Parker · Accepted Answer

Final Answer : A, Explanation :  Down syndrome, also known as trisomy 21, is the most common extra-chromosome condition. It occurs when there is an extra copy of chromosome 21, resulting in intellectual disabilities, characteristic facial features, and other health issues.

The MOST common extra-chromosome condition is:

A) Down syndrome.
B) nearsightedness.
C) fragile X syndrome.
D) Tourette syndrome.

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