Which of the following diseases is caused by an abnormal chromosome inherited before birth?
a. sickle cell anemia
b. diabetes
c. huntington's disease
d. turner syndrome

Correct answer is answer C. Huntington's disease (HD) it is neurodegenerative genetic disorder it leads to mental decline, affects muscle coordination.

Disease usually begin between 35-44 years of age, only about 6% cases start before 21 years of age. It's estimated that people affected by this disease have 15-20 years of life after syndromes appears.

Typical syndromes:

-uncontrolled movements 
-hand/fingers tremor
-mental disorder
-dementia
-personality change
-depression

Symptom intensity progress with time.

It's cause by an autosomal dominant mutation, it means that child of affected parent have 50% chance of inheriting this disease. Defective gene causing disease appears on short arm of 4th chromosome.

Confused on question what should we be answering