单词	trisomy
释义	trisomy1 /ˈtrɪsəmi / noun Medicine A condition in which an extra copy of a chromosome is present in the cell nuclei, causing developmental abnormalities.The aneuploid embryos detected in the progeny from this cross include trisomies and UPDs of chromosomes 7 and 18.... Both monosomy and trisomy of specific chromosomes are associated with developmental defects and cancer risk. A common type of chromosomal abnormality is called a trisomy. Origin 1930s: from tri- 'three' + -some3. trisomy-212 noun [mass noun] Medicine The most common form of Down’s syndrome, caused by an extra copy of chromosome number 21.Microcephaly can also be caused by the chromosomal disorder, trisomy-21 Down syndrome, and by environmental factors, such as fetal alcohol syndrome and fetal exposure to radiation before 15 weeks gestation.... Trisomy 21 can be detected in the first few months of pregnancy by amniocentesis. The majority (about 94%) of children with Down Syndrome are born with standard Trisomy 21, which is not hereditary.
随便看	abbey labourer abbey laird abbey land abbey-like abbey-lubber abbey man abbey piece Abbey Road abbey-stead abbot abbot-bishop abbotcy abbotess abbot-general abbot-presbyter abbotship abbot sovereign Abbott, Berenice Abbott's booby Abbott, Sir John Abbott, Tony abbozzo abbr. abbreviate ostiate

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