Down syndrome in humans is due to three copies of chromosome 21?

Question

A) True

B) False

Answer 1

True: Down's Syndrome is also called Trisomy 21.

It can also be caused by a third partial copy of chromosome 21 (ie doesn't have to be a full copy of chromosome 21).

Answer 2

True... It's due to three copies of all or even part of chromosome 21.  It's the most common trisomy.  Most others are fatal.

Answer 3

True!

Answer 4

Mostly true. There are actually three different kinds of down syndrome. The most common causing over 95% of the cases is caused by a third copy of chromosome 21. I don't remember the exact names of them though.

Answer 5

True