Down Syndrome is a disorder caused by an extra chromosome on the chromosome 21 pair, giving the person a total of 47 chromosomes rather than the normal 46. This disorder results in mild to severe learning disabilities and physical symptoms including a small skull, extra folds of skin under the eyes, and a flattened nose bridge. The condition was formerly known as mongolism because the features of people with Down syndrome were thought to resemble those of Mongolian Asians but now this term is considered offensive and inappropriate so it's no longer used.
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