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what is a trisomy 21?

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trisomy 21 is actually more commonly known as down syndrome
how many double chromosomes are there?
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umm lemme see
i do not know that but i don know that there is an extra 21'st chromsome hence the name trisomy 21
oh okay. thanks. normal humans have 46 double chromosomes right?
thanks so much!
no problem
Please note that it's "Down's syndrome" because it was described first by a physician named JL Down.
Ok, so basically trisomy 21 is another name for Down's syndrome. As you've already said, human's normally have 46 chromosomes, or twenty-three pairs, which they are often divided into, because each pair looks similar. I'll include a picture. Anyways, normally each pair has 2, but in the event that there is a mutation, then there can be a monomy or a trisomy. A monomy is where there is only one of the two chromosomes in the pair, or a trisomy is an extra chromosome. So that's about it, hope the background info helps. :D
do you know how many double chromosomes there are? i know there are 23 homologous pairs
Here's a good pic to show you...
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