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Down syndrome

A range of birth defects caused by the foetus having an extra copy of chromosome 21 (trisomy 21).

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down syndrome
Parenting; Pregnancy

The most common chromosomal abnormality, Down syndrome results when a fetus has an extra copy of chromosome number 21. It causes mild to severe mental retardation, as well as ...

down syndrome
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The set of physical, mental, and functional abnormalities that result from trisomy 21, the presence in the genome of three, rather than the normal two, chromosomes 21. Down ...

down syndrome
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A genetic disorder characterized by some degree of mental retardation and by various physical malformations, such as slanted eyes and a broad face.

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