Genetics Quiz#28 Trinucleotide repeat expansion diseases

1. A 23-year-old woman presents with progressive difficulty walking, slurred speech, and a family history of similar symptoms. Genetic testing reveals an abnormal number of trinucleotide repeats. Which of the following repeats is most likely increased in this patient? 

Question 1 of 5

2. A 40-year-old man develops involuntary jerking movements of his arms and face, accompanied by emotional instability and cognitive decline. Which of the following genetic mutations is most likely responsible for his condition? 

Question 2 of 5

3. A newborn boy is noted to have macroorchidism at birth. As he grows, he develops significant learning difficulties and behavioral problems. Genetic testing is performed. Which of the following trinucleotide repeat expansions is most likely to be found? 

Question 3 of 5

4. A 35-year-old man presents with muscle wasting, difficulty relaxing his muscles after contracting them, and cataracts. Which trinucleotide repeat expansion is most commonly associated with this condition? 

Question 4 of 5

5. A 50-year-old woman presents with progressive loss of coordination, slurred speech, and nystagmus. Her father had similar symptoms. Genetic testing reveals a trinucleotide repeat expansion. Which of the following diseases is she most likely to have? 

Question 5 of 5


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