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  2. Down syndrome - Wikipedia

    en.wikipedia.org/wiki/Down_syndrome

    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.

  3. Everything you need to know about Down syndrome - AOL

    www.aol.com/news/everything-know-down-syndrome...

    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.

  4. Genetics of Down syndrome - Wikipedia

    en.wikipedia.org/wiki/Genetics_of_Down_syndrome

    An anaphase lag of a chromosome 21 in a Down syndrome embryo leads to a fraction of euploid cells (2n cells), phenomenon described as "aneuploidy rescue". There is considerable variability in the fraction of cells with trisomy 21, both as a whole and tissue-by-tissue. This is the cause of 1–2% of the observed Down syndromes. [4]

  5. Developmental disability - Wikipedia

    en.wikipedia.org/wiki/Developmental_disability

    Down syndrome is a genetic condition in which people are born with an extra copy of chromosome 21. This extra copy affects the development of the body and brain, causing a range of physical and mental impairments for the individual. Fragile X syndrome, most frequent among males, is thought to cause autism and intellectual disability.

  6. National Down Syndrome Society - Wikipedia

    en.wikipedia.org/wiki/National_Down_Syndrome_Society

    The National Down Syndrome Society (NDSS) is an American organization that offers support to people with Down syndrome, their families, friends, teachers, and coworkers, and educates the general public about Down syndrome. The mission of the NDSS is to be the leading human rights organization for all individuals with Down syndrome. [1]

  7. List of people with Down syndrome - Wikipedia

    en.wikipedia.org/wiki/List_of_people_with_Down...

    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 ...

  8. Global developmental delay - Wikipedia

    en.wikipedia.org/wiki/Global_developmental_delay

    Global developmental delay is an umbrella term used when children are significantly delayed in two or more areas of development. It can be diagnosed when a child is delayed in one or more milestones, categorised into motor skills, speech, cognitive skills, and social and emotional development. [1]

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