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3 days ago · Down syndrome or Down's syndrome, also known as trisomy 21, is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21. It is usually associated with developmental delays, mild to moderate intellectual disability, and characteristic physical features.
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4 days ago · 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.
- The Editors of Encyclopaedia Britannica
5 days ago · Caused by an extra copy of chromosome 21, the syndrome in modern people can cause diverse health issues and developmental delays, including partial or total hearing loss. These can vary widely in severity, but many symptoms may have been more challenging for prehistoric families to navigate.
1 day ago · Down Syndrome: What I Wish You Knew. For people with Down syndrome to succeed, we need to look beyond assumptions. I’m proof of that. Minutes after I was born, doctors told my parents that because I had Down syndrome, I would most likely never learn to read or write. They said that one day, I’d end up working in a sheltered workshop for the ...
4 days ago · According to the study, life expectancy in 1929 for children with Down syndrome, a condition caused by an extra partial or full chromosome, was 9 years. By the 1940s, the expected lifespan had ...
5 days ago · People with Down syndrome have an extra copy of chromosome 21. The condition can cause delays in learning how to walk or speak. A study published in February identified five ancient cases...
3 days ago · A 6-year-old Neanderthal child had Down syndrome, a new analysis of an oddly shaped ear bone found in a cave in Spain suggests. The finding is the first known case of Down syndrome in Neanderthals ...
