the presence of an extra chromosome, resulting in a total of three copies of that chromosome instead of the normal 2 copies (e.g., trisomy 21, or down syndrome).
出典:Wiktionary
出典:『Wiktionary』 (2025/05/19 20:58 UTC 版)
From trisome + -y.
trisomy (countable and uncountable, plural trisomies)
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