Down syndrome ,karyotype analysis, third copy of chromosome 21 ,MR ,non dysjunction 95 % of cases

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Aneuploidy, chromosomal abnormalities
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What are the 3 types of Down syndrome?

There are three types of Down syndrome:

Trisomy 21. This is by far the most common type, where every cell in the body has three copies of chromosome 21 instead of two.

Translocation Down syndrome. In this type, each cell has part of an extra chromosome 21, or an entirely extra one. ...

Mosaic Down syndrome

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