Down Syndrome Answers: What is Down syndrome? 

The best person to answer a question about Down syndrome is a person with Down syndrome. Krystal answers this one.
cdss.ca/down-sy...
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What is Down syndrome? Well, I have Down syndrome. Well, what is Down syndrome - is that there is three copies of chromosome 21, with trisomy 21, but with one more extra chromosome for people with Down syndrome. All I know is it’s never slowed me down.