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24 December, 15:45

An extra copy of chromosome 21 in humans causes

Down syndrome

cystic fibrosis

HIV

none of the above

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Answers (2)
  1. 24 December, 16:05
    0
    Down syndrome is when there is an extra copy of chromosome 21
  2. 24 December, 16:24
    0
    Down syndrome is the result of an extra copy of chromosome 21 in a human.
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