Children with this genetic disease have 3 no. 21 chromosomes instead of the usual 2
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approaches to predict the number of genes on each chromosome,... [DOC] [TLE] Down syndrome - Genetics Home Reference [PAR] 4 days ago ... Down syndrome is a chromosomal condition that is associated with intellectual 
disability, a characteristic facial appearance, and weak muscle... [DOC] [TLE] 13 chromosomal disorders you may not have heard of [PAR] May 22, 2012 ...