Origin of Down syndromeafter J. L. H. Down (1828-96), British physician
down syndromeDown syndrome
- The extra chromosome often causes some level of mental retardation and is the number one cause of human birth defects
- Down syndrome affects one out of every 660 births.
- Older couples are more likely to produce offspring with the condition.
- 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.
- Down syndrome can be diagnosed before or after birth.
- Common symptoms in children include slowed movement, reduced fertility, difficulty with speech, hearing loss, smaller heads with flat faces, short stature.
Facts About Down Syndrome
An example of down syndrome is a baby born with an extra chromosome.
or Down's syndrome
Origin of Down syndromeAfter John Langdon Haydon Down (1828-1896), British physician
Down's Syndrome (dounz)
Known only as Down's syndrome in the UK.
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.
down syndrome - Medical Definition
or Down's syndrome (dounz)
- This factor may be due to the characteristic facial abnormalities and relatively large tongues of Down-syndrome children.
- Nevertheless, Down-syndrome children often are very sociable and interested in conversational language.