Trisomy 21
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[Another] [name] for Down [Syndrom].
Trisomy 21 meaning & definition 1 of Trisomy 21.
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the most common form of Downs syndrome (= a genetic condition associated with learning difficulties in which a person is born with an extra chromosome ) that is caused by there being an extra copy of the chromosome number 21 in the bodys cells:
Trisomy 21 meaning & definition 2 of Trisomy 21.