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The clinical name for Down syndrome is trisomy 21, a genetic condition in which a person is born with an extra chromosome, causing mild to moderate cognitive disability, developmental delays and physical challenges.—Stephen Hawkins, Chicago Tribune, 18 Jan. 2025 The causes behind Down syndrome are not entirely clear, but scientists have noted, among other things, a common link between older maternal age and trisomy 21.—Krissi Danielsson, Parents, 30 July 2024 The most common type of Down syndrome is trisomy 21, which accounts for 95% of all cases.—Angelica Stabile, Fox News, 7 Oct. 2024 For example, babies with trisomy 21 have Down syndrome.—Krissi Danielsson, Parents, 30 July 2024 See all Example Sentences for trisomy 21
Word History
Etymology
from the occurrence of trisomy in chromosome 21 of persons with Down syndrome
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