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Down Syndrome
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Down syndrome (also named Trisomy 21) is a genetic condition characterized by the presence of an extra chromosome in the cells, instead of 46 chromosomes in the nucleus of every cell there are 47. There is an extra chromosome n. 21. Genetic does not mean hereditary, in fact 98% of cases of Down syndrome is not hereditary. The consequence of this chromosomal alteration is a disability characterized by a variable degree of delay in mental development, physical and motor of the child.
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