Extra chromosome mtl: The traditional ds patient has an extra 21 chromosome(c) that resulted from an improper splitting of the c pairs as the egg is being formed.At conception dad's 21 is added to the pair already there, while all the other chromosomes just have a pair.Cell division from conception will place the triplet 21 in every cell of the body, and the imbalance of the material leads to the features of ds.
Answered 12/9/2013
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