<prompt> Which of the following is an example of Trinucleotide repeat mutation ?Huntingtons choreaFragile-X-syndromeFriedreich ataxiaAll of the above  <response>: Ans. is d i.e., All of the above Trinucleotide repeat mutation In this type of mutation a codon i.e. trinucleotide sequence undergoes amplification and the same codon is repeated continuously so many times in the chain. Diseases associated with trinucleotide repeat mutation are Huntingtons disease CAG repeat, Spinocerebellar ataxia CAG repeat, friedreich ataxia GAA repeat, fragile-X-syndrome GGG or GCC repeat, dystrophia myotonica CTGCUG repeat, X-linked spinobulbar muscular atrophy CAG repeat and dentorubral pallidolusian atrophy CAG repeat. 