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anonymous
 4 years ago
what is a trisomy 21?
anonymous
 4 years ago
what is a trisomy 21?

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anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0trisomy 21 is actually more commonly known as down syndrome

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0how many double chromosomes are there?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0does that answer your question?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0i do not know that but i don know that there is an extra 21'st chromsome hence the name trisomy 21

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0oh okay. thanks. normal humans have 46 double chromosomes right?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Please note that it's "Down's syndrome" because it was described first by a physician named JL Down.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Ok, so basically trisomy 21 is another name for Down's syndrome. As you've already said, human's normally have 46 chromosomes, or twentythree 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

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0do you know how many double chromosomes there are? i know there are 23 homologous pairs

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Here's a good pic to show you...
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