<prompt> True about fragile-X syndrome -Triple nucleotide repeat sequenceChromosome breakingMitochondrial mutationCentrachrome absent  <response>: Ans. is a i.e., Triple nucleotide repeat sequence Trinucleotide-repeat mutations disorders Expansion affecting coding regions Expansion affecting non-coding regions o Spinobulbar muscular atrophy Kennedy disease o Fragile-X syndrome o Huntington disease o Freidreich ataxia o Dentatorubral-pallidaluysion atrophy Haw river syndrome o Myotonic dystrophy o Spinocerebellar ataxia 