The Heritable Disorder Fragile X Syndrome, a Major Cause of Intellectual

question 14

Multiple Choice

The heritable disorder fragile X syndrome, a major cause of intellectual disability, is caused by

• A)production of enzymes that break the phosphate backbone.
• B)UV light.
• C)X-rays.
• D)the presence of an extra X chromosome in the sperm or egg.
• E)the expansion of a region of trinucleotide repeats.

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