The Smiths' doctor told them that their child will be born with the most common chromosomal disorder,which is

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Down syndrome is the most common chromosomal disorder, occurring in about 1 in 700 births. Turner's syndrome involves a missing or incomplete X chromosome in females, Fragile X syndrome involves a defect on the X chromosome which can cause intellectual disability, and Klinefelter's syndrome involves an extra X chromosome in males.

The Smiths' Doctor Told Them That Their Child Will Be