Dictionary of Biological Psychology
There are a number of abnormalities of CHROMOSOMES recognized in humans. Some 4% of all recognized pregnancies involve a foetus with a chromosome abnormality.
However, most spontaneously terminate and only some 0.5% of live births involve infants with chromosome abnormalities. A proportion of these will be severe enough to limit life, but infants with a number of recognized conditions do survive and enjoy healthy lives. The majority of the cases of chromosome abnormality involve DOWN SYNDROME or TRISOMY 21, but there are many others: see for example FRAGILE x SYNDROME, KLINEFELTER’S SYNDROME (XXY syndrome), PHENYLKETONURIA, XYY SYNDROME, TURNER’S SYNDROME and TRIPLE x SYNDROME (XXX syndrome)
See also: amniocentesis; X and Y chromosomes
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