Human #21 chromosome can have three copies {mongolism} {Down's syndrome} {Down syndrome}, rather than two, resulting in mental retardation. Symptoms are flattened face, thick and large tongue, extra eyelid folds, uncoordinated movements, and IQ between 20 and 60. Down's syndrome patients over 35 years have same pathological brain changes as Alzheimer's patients. Extra 21st chromosomes relate to infectious hepatitis.
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Date Modified: 2022.0224