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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]
  • Down Syndrome | Birth Defects | CDC
    Key points Down syndrome is a genetic condition where a person is born with an extra chromosome This can affect how their brain and body develop People diagnosed with Down syndrome can lead healthy lives with supportive care
  • 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
  • Down Syndrome: Symptoms Causes - Cleveland Clinic
    Down syndrome is a genetic condition where a person has an extra copy of chromosome 21 for a total of 47 chromosomes instead of 46
  • About Down Syndrome | National Down Syndrome Society (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: Causes, Symptoms, Diagnosis, and Treatment - WebMD
    People with Down syndrome have an extra chromosome that impacts their looks and their ability to think, learn, and reason Discover the type, causes, and kinds of effects it can have
  • Symptoms and Characteristics of Down Syndrome - Verywell Health
    This article explains Down syndrome and how it is diagnosed It discusses Down syndrome's causes, the physical and cognitive effects of the disorder, and what it means for people living with it
  • Down syndrome | Definition, Chromosome, Symptoms, Causes, Life . . .
    Down syndrome, congenital disorder caused by the presence in the human genome of extra genetic material from chromosome 21 The affected individual may inherit an extra part of chromosome 21 or an entire extra copy of chromosome 21, a condition known as trisomy 21
  • 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





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