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Down syndrome or Down's syndrome, [12] also known as trisomy 21, is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21. [3] It is usually associated with developmental delays, mild to moderate intellectual disability , and characteristic physical features.
Mosaic Down syndrome: Only some cells in the person have an extra copy of chromosome 21. This genetic cause is considered rare. This genetic cause is considered rare.
Adults with Down syndrome often develop chronic health problems, such as severe sleep apnea, digestive disorders, thyroid conditions, and obesity. Many develop Alzheimer’s disease in middle age.
DOOR syndrome; Dopamine dysregulation syndrome; Down syndrome; Dravet syndrome; Dressler syndrome; Drug reaction with eosinophilia and systemic symptoms; Dry eye syndrome; Duane syndrome; Duane-radial ray syndrome; Dubin–Johnson syndrome; Dubowitz syndrome; Dumping syndrome; Dysexecutive syndrome; Dyskeratosis congenita; Dysplastic nevus syndrome
This is a list of major and frequently observed neurological disorders (e.g., Alzheimer's disease), symptoms (e.g., back pain), signs (e.g., aphasia) and syndromes (e.g., Aicardi syndrome). There is disagreement over the definitions and criteria used to delineate various disorders and whether some of these conditions should be classified as ...
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The average IQ of a young adult with Down syndrome is 50, equivalent to the mental age of an 8- or 9-year-old child, but this number varies widely. [3] At the same time, they enjoy a rich social and emotional awareness. [4] Down syndrome is the most common chromosome abnormality in humans, [3] occurring in about one per 1000 babies born each ...
While it is often found in people with Down Syndrome, [3] many who have this syndrome do not have this crease, and thus is not a diagnostic indicator of Down Syndrome. The presence of a single transverse palmar has been associated with several abnormal medical conditions—that is, it is found at a higher than 1.5% frequency, but in all of ...