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.
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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

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).

ask your friends for what they got then copy it down if you don't have any friends which is fine than google it or pay the teacher