Fragile X syndrome is caused by a(n)
A) deletion.
B) translocation.
C) expanding triplet repeat.
D) point mutation.
E) brittle nucleotides.

Question

Quizplus · Accepted Answer

Fragile X syndrome is caused by an expanding triplet repeat, specifically a CGG repeat in the FMR1 gene on the X chromosome. This repeat expansion leads to decreased production of the FMR1 protein, which is important for normal brain development and function. It is not caused by a deletion, translocation, point mutation, or brittle nucleotides.

Fragile X Syndrome Is Caused by A(n)