How do people affected by Down's Syndrome inherit the disease?!

Question: How do people affected by Down's Syndrome inherit the disease.?
Answers:

"Down's syndrome, or trisomy 21 is a chromosomal disorder caused by the presence of all or part of an extra 21st chromosome." (wikipedia)

Basically there is a mutation and the person gets one extra chromosome.. Google it.Health Question & Answer

http://pediatrics.about.com/od/birthdefe...Health Question & Answer

mutation of chromosome 21 X Health Question & Answer

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How do people affected by Down's Syndrome inherit the disease?!

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