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Chromosomes PowerPoint 2009-2010

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Down Syndrome: What’s Wrong?<br />

• Writing notation:<br />

1 t – 1 l st : total<br />

chromosome #<br />

2nd – 2 S nd : Sex<br />

chromosomes<br />

3rd – 3 : extra or<br />

rd : extra or<br />

missing<br />

• Down Syndrome:<br />

• Down Syndrome:<br />

47, XY, +21

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