Health / Medical Topics |
Chromosome 21
Definition 1
The designation for each member of the second smallest human autosomal chromosome pair. Chromosome 21 spans around 47 million nucleotides and represents about 1.5% of the total DNA in normal diploid cells. (NCI Thesaurus)
Definition 2
One of the two pairs in the seventh group (or group G) of human chromosomes according to the current classification for humans. (NLM, Medical Subject Headings)
Definition 3
chromosome found in a trisomic state in the cells of persons with Down syndrome. (NIH CRISP Thesaurus)
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