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thecity Group Title

what is a trisomy 21?

  • 2 years ago
  • 2 years ago

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  1. mud116 Group Title
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    trisomy 21 is actually more commonly known as down syndrome

    • 2 years ago
  2. thecity Group Title
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    how many double chromosomes are there?

    • 2 years ago
  3. mud116 Group Title
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    does that answer your question?

    • 2 years ago
  4. mud116 Group Title
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    umm lemme see

    • 2 years ago
  5. mud116 Group Title
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    i do not know that but i don know that there is an extra 21'st chromsome hence the name trisomy 21

    • 2 years ago
  6. thecity Group Title
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    oh okay. thanks. normal humans have 46 double chromosomes right?

    • 2 years ago
  7. mud116 Group Title
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    yes

    • 2 years ago
  8. thecity Group Title
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    thanks so much!

    • 2 years ago
  9. mud116 Group Title
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    no problem

    • 2 years ago
  10. ebaxter01 Group Title
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    Please note that it's "Down's syndrome" because it was described first by a physician named JL Down.

    • 2 years ago
  11. Karrie96 Group Title
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    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

    • 2 years ago
  12. thecity Group Title
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    do you know how many double chromosomes there are? i know there are 23 homologous pairs

    • 2 years ago
  13. Karrie96 Group Title
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    Here's a good pic to show you...

    • 2 years ago
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