Down syndrome - Wikipedia 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 [1][13]
Down syndrome - Symptoms and causes - Mayo Clinic Down syndrome varies in severity among individuals The condition causes lifelong intellectual disability and developmental delays It's the most common genetic chromosomal cause of intellectual disabilities in children It also commonly causes other medical conditions, including heart and digestive system problems
Downs | England, Map, Facts | Britannica Downs, rounded and grass-covered hills in southern England that are typically composed of chalk The name comes from the Old English dūn (“hill”) The main areas of chalk downs lie in Berkshire, Wiltshire, and northern Hampshire, with spurs running eastward into West Sussex, Surrey, and Kent
Facts, Myths, Truths About Down Syndrome - NDSS Down syndrome occurs when an individual has a full or partial extra copy of chromosome 21 This additional genetic material alters the course of development and causes the characteristics associated with Down syndrome
About Down Syndrome - National Human Genome Research Institute Down syndrome can be diagnosed in infancy based on the characteristic clinical findings When Down syndrome is suspected in a person, a genetic test called a chromosome analysis is performed on a blood or skin sample to look for an extra chromosome 21 (trisomy 21)
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