<prompt> Fredrichs ataxia is caused by which type of mutation-Point mutationExpanded trinucleotide repeatMissense mutationInversion  <response>: Ans. is b i.e., Expanded trinucleotide repeat o Freidrich ataxia is an autosomal recessive disorder.o It is caused by loss of functional mutation in frataxin gene FxN gene.o Frataxin gene is located on chromosome 9ql 3.o Majority of patients have an expanded trinucleotide repeat in intron 1 of both alleles of frataxin gene. 