Down-syndrome meaning

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The definition of down syndrome is a chromosomal disorder also known as trisomy 21 or trisomy G which is caused by a partial or full extra 21st chromosome.
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The extra chromosome often causes some level of mental retardation and is the number one cause of human birth defects.
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Down syndrome affects one out of every 660 births.
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Older couples are more likely to produce offspring with the condition.
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Down syndrome is typically the product of a mistake in cell division at the time of conception, resulting in an embryo with a third copy of the 21st chromosome, instead of the typical two copies.
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Down syndrome can be diagnosed before or after birth.
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Common symptoms in children include slowed movement, reduced fertility, difficulty with speech, hearing loss, smaller heads with flat faces, short stature.

An example of down syndrome is a baby born with an extra chromosome.

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A congenital disorder caused by the presence of an extra 21st chromosome and marked usually by moderate to severe mental retardation, short stature, and a flattened facial profile.
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A congenital condition characterized by abnormal chromosomes, mental deficiency, a broad face, slanting eyes, a short fifth finger, etc.
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A congenital disorder caused by the presence of an extra 21st chromosome and marked usually by moderate to severe intellectual disabilities, short stature, and a flattened facial profile.
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A congenital disorder caused by the presence of an extra 21st chromosome. People with Down syndrome have mild to moderate mental retardation, short stature, and a flattened facial profile. The syndrome is named after its discoverer, British physician John Langdon Haydon Down (1828–1896).
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(chiefly US) Condition caused by a chromosomal excess, whereby the patients bear a certain resemblance to the Mongoloid race, such as a small head and tilted eyelids, and typically have a delay in cognitive ability and physical growth.
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Origin of down-syndrome

  • After John Langdon Haydon Down (1828–1896), British physician
    From American Heritage Dictionary of the English Language, 5th Edition
  • Named after John L.H. Langdon-Down (1828-1896), an English physician who described it in the late 1800s. The term was first used in 1961.
    From Wiktionary