A Down syndrome child is always mentally impaired to some degree.
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Q50: In Down syndrome chromosome 21 is inherited
Q51: _ villus sampling involves removing cells from
Q52: An amniocentesis can only detect about 50
Q53: Abnormalities of sex-linked inheritance tend to occur
Q54: In the cause of familial diseases, there
Q55: Congenital diseases can be transmitted to offspring.
Q56: DNA, which stands for _ acid, is
Q57: Specialized cells in the ovaries and testis,
Q58: Two of the chromosomes, the X and
Q59: _ are alternative forms of a gene,
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