A fatal central nervous system disorder caused by more than 35 repetitions of a particular set of three base pairs is:
A) Down syndrome.
B) nearsightedness.
C) fragile X syndrome.
D) Huntington's disease.

Question

Quizplus · Accepted Answer

Huntington's disease is caused by an abnormality in the HTT gene where more than 35 repetitions of CAG (cytosine-adenine-guanine) base pairs occur. This causes the production of a mutant form of the huntingtin protein which leads to the destruction of certain nerve cells in the brain, causing severe and progressive neurological symptoms. Down syndrome and fragile X syndrome are genetic disorders caused by extra genetic material on chromosomes 21 and X respectively, while nearsightedness is a vision disorder caused by a variety of factors such as genetics and environmental factors.

A Fatal Central Nervous System Disorder Caused by More Than