What disease is caused by trisomy 21?

Asperger syndrome
cri-du-chat (cat meowing syndrome)
Down syndrome
Patau syndrome
Most cases of Down syndrome are caused by trisomy 21. Occasionally, the extra chromosome #21 or a portion of it is attached to another chromosome in the egg or sperm; this may cause "translocation Down syndrome." This is the only form of Down syndrome that may be inherited from a parent.
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Answers by country

Asperger syndrome
cri-du-chat (cat meowing syndrome)
Down syndrome
Patau syndrome
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