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Updated: Sep 10, 2025

Fetal Mouse Cardiovascular Imaging Using a High-frequency Ultrasound 30/45MHZ System
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与唐氏综合症胎儿减少相关的全国变量

Petrus H F M van Casteren1, Gert de Graaf2, Frank Buckley3,4

  • 1Amsterdam School of Economics, University of Amsterdam, Amsterdam, the Netherlands.

American journal of medical genetics. Part A
|August 21, 2025
PubMed
概括

政府对产前查的政策显著减少了唐氏综合征 (DS) 的活产. 增加查的可用性和补偿,以及母亲的年龄和收入,与选择性终止导致的DS出生率相对相关.

关键词:
唐氏综合症堕胎胚胎细胞检查胆膜样本采集产前查三重症 21

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During meiosis, chromosomes occasionally separate improperly. This occurs due to failure of homologous chromosome separation during meiosis I or failed sister chromatid separation during meiosis II. In some species, notably plants, nondisjunction can result in an organism with an entire additional set of chromosomes, which is called polyploidy. In humans, nondisjunction can occur during male or female gametogenesis and the resulting gametes possess one too many or one too few chromosomes.
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