Down Syndrome Answers: What causes Down syndrome?

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The best person to answer a question about Down syndrome is a person with Down syndrome. Dylan answers this one.

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What causes Down syndrome? We don’t know why it happens. It’s an extra chromosome in the 21st chromosome. There are three types of Down syndrome. There’s Trisomy 21, Translocation, and Mosaic Down syndrome. The one I have is Translocation. I hope that answers your question.
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I forgot about translocation. I’m going to go learn about that more.

sahpem