Skip to main content
Like
Create new Glog
previous
next
Email share
45 views | 0 likes | 0 reposts
Down syndrome (DS), also called Trisomy 21, is a condition in which extra genetic material causes delays in the way a child develops, both mentally and physically. It affects about 1 in every 800 babies.
Down Syndrome is named after John Langdon Down, the British doctor who first described the condition in 1887. It wasn't until 1959, however, that an extra chromosome was identified as the cause.
Normally, at the time of conception a baby inherits genetic information from its parents in the form of 46 chromosomes: 23 from the mother and 23 from the father. In most cases of Down syndrome, a child gets an extra chromosome 21 — for a total of 47 chromosomes instead of 46. It's this extra genetic material that causes the physical features and developmental delays associated with DS.
Down Syndrome
Video About DS
