Aneuploidy, Robertsonian translocation, mosaicism, prenatal screening, physical exam findings, Down's syndrome, Edward's syndrome, Patau syndrome, Klinefelter syndrome, Turner syndrome, Triple X syndrome, XYY syndrome, Cri Du Chat syndrome, Wolf-Hirschhorn syndrome, Jacobsen and Paris-Troussaeu syndromes, Charcot-Marie-Tooth syndrome, Prader-Willi and Angelman syndromes, trinucleotide repeat disorders, Fragile X syndrome, Huntington Disease, Myotonic dystrophy Type I, spinocerebellar ataxia, and Friedrich ataxia.