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....
Origin1930s: from tri- 'three' + -some3. trisomy-212noun [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....
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