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thecity

  • 4 years ago

what is a trisomy 21?

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  1. mud116
    • 4 years ago
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    trisomy 21 is actually more commonly known as down syndrome

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

  3. mud116
    • 4 years ago
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    does that answer your question?

  4. mud116
    • 4 years ago
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    umm lemme see

  5. mud116
    • 4 years ago
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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

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

  7. mud116
    • 4 years ago
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    yes

  8. thecity
    • 4 years ago
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    thanks so much!

  9. mud116
    • 4 years ago
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    no problem

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

  11. Karrie96
    • 4 years ago
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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

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

  13. Karrie96
    • 4 years ago
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    Here's a good pic to show you...

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