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chromosomal disorder |
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chromosomal disorderSyndrome caused by chromosome abnormality. Normally, humans have 23 pairs of chromosomes, including one pair of sex chromosomes. Any variation from this pattern causes abnormalities. A chromosome may be duplicated (trisomy) or absent (monosomy); one or more extra full sets of chromosomes can be present (see ploidy); or part of a chromosome may be missing (deletion) or transferred to another (translocation). Resulting disorders include Down syndrome, intellectual disability, heart malformation, abnormal sexual development, malignancies, and sex-chromosome disorders (e.g., Turner syndrome, Klinefelter syndrome). Chromosomal disorders occur in 0.5% of births; many can now be diagnosed before birth by amniocentesis. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Upon fertilization, their eggs' genes exhibited error-prone separations and copying, leading to chromosome abnormalities in some 40 percent of fetuses developing in female mice whose only exposure to BPA had been in the womb. Specifically, when beta-pseudouridine is administered, the risk of chromosome abnormalities in human lymphocytes is reduced by 34%. Neuropsychological and functional cognitive skills of 35 unselected adults with sex chromosome abnormalities. |
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