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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 is a genetic condition caused when an unusual cell division results in an extra full or partial copy of chromosome 21 This extra genetic material causes the developmental changes and physical features of Down syndrome
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
Down Syndrome - Harvard Health Down syndrome is a disorder caused by having an extra chromosome Chromosomes are pieces of DNA that have the blueprint for the human body Normally a person has two copies of each chromosome, but a person with Down syndrome has three copies of chromosome 21 The condition also is called trisomy 21
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)
What is Down Syndrome? - Down Syndrome Resource Foundation Down syndrome is a naturally occurring genetic condition in which a child is born with an extra copy of chromosome 21 As a result, certain genes on chromosome 21 are over-expressed, impacting an individual in many ways