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B. Fragile X syndromeAneuploidy is when the chromosome number is not an exact multiple of the haploid number. Down syndrome (trisomy 21), Turner syndrome (45, X), and Klinefelter syndrome (47, XXY) are all examples of aneuploidy. In contrast, Fragile X syndrome is characterized by expansion of a CGG triplet repeat in the first exon of the FMR-1 gene on the long arm of the X chromosome, with the total chromosome number not being affected (i.e. still euploid)
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