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Fragile X syndrome is a sex-linked disorder found mostly in boys, characterized by mental impairment, large ears, a long face, heart defects, and flat feet. It is caused by a mutation to the gene shown in the picture above. The codon CGG is abnormally repeated many times, causing the cell to inactivate the gene. Such a mutation is known as a(n)

Ainsertion.
Binversion.
Cdeletion.
Dduplication.

Verified Answer :

D) duplication seems to be the most reasonable answer here. 

In the question is says that the codon CGG is abnormally repeated many times. That sounds like duplicating to me!!

Hope this helps.

Correct answer: D). Duplication

It is a disease that is caused by the repetition of codon for many times, which will lead to inactivation of gene that is required for the proper function of brain and other body functions.

In this disease the codon triplet CGG is repeated many times causing mutation in the gene CFR1. The main symptoms of this disease is mental impairment and heart problem etc.





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