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  • 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 - 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]
  • 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: Causes, Symptoms, Diagnosis, and Treatment - WebMD
    What Is Down Syndrome? Down syndrome is a genetic condition that causes mild to significant physical and developmental problems People with Down syndrome (DS) are born with an extra chromosome
  • 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
  • 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
  • About Down Syndrome - National Human Genome Research Institute
    Most cases of Down syndrome are not inherited, but occur as random events during the formation of reproductive cells (eggs and sperm) An error in cell division called nondisjunction results in reproductive cells with an abnormal number of chromosomes
  • Down Syndrome: Causes, Types, and Symptoms - Healthline
    Down syndrome is the most common genetic condition in the United States We’ll explain the causes, symptoms, and outlook of this condition
  • 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





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