Explain mechanism by which triplet expansion occurs


Assignment task: We saw in lecture that a number of triplet expansions are associated with a variety of genetic disorders. Why only triplet expansions? i.e. why not dimer or quadruplet expansions? Fragile X syndrome results from triplet expansions in the non-coding region of the Fmrl gene on the X chromosome. What does this tell you about the mechanism by which triplet expansion occurs?

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Biology: Explain mechanism by which triplet expansion occurs
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