In most cases, Down syndrome happens when there is an extra copy of chromosome 21. This form of Down syndrome is called Trisomy 21. The extra chromosome causes problems with the way the body and brain develop .Down syndrome is a genetic condition in which a person has 47 chromosomes instead of 46. • Decrease muscle tone at birth • Excess skin at the nape of the neck • Flattened nose • Separated joints between the bones of the skull • Single crease in the palm of the hand • Small ears • Small…
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