anonymous
  • anonymous
what is a trisomy 21?
Biology
  • Stacey Warren - Expert brainly.com
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
trisomy 21 is actually more commonly known as down syndrome
anonymous
  • anonymous
how many double chromosomes are there?
anonymous
  • anonymous
does that answer your question?

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anonymous
  • anonymous
umm lemme see
anonymous
  • anonymous
i do not know that but i don know that there is an extra 21'st chromsome hence the name trisomy 21
anonymous
  • anonymous
oh okay. thanks. normal humans have 46 double chromosomes right?
anonymous
  • anonymous
yes
anonymous
  • anonymous
thanks so much!
anonymous
  • anonymous
no problem
anonymous
  • anonymous
Please note that it's "Down's syndrome" because it was described first by a physician named JL Down.
anonymous
  • anonymous
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
anonymous
  • anonymous
do you know how many double chromosomes there are? i know there are 23 homologous pairs
anonymous
  • anonymous
Here's a good pic to show you...
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