Fragile x syndrome - disorder in humans caused by the inheritance of genes that have undergone insertions of a string of 3 or 4 nucleotides, repeated over and over.
true
false

TRUE

Explanation:

Fragile X syndrome  is a disorder in which nucleotide repeats will result in increase in copy number which will make the threshold unstable < it is basically a trinucleotide repeat disorder

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.