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21 September, 16:59

Which type of chromosomal mutation causes this form of Down syndrome?

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  1. 21 September, 17:10
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    It depends, how many chromosomes have you sacrificed to Chin Chin today?
  2. 21 September, 18:38
    0
    Nondisjunction

    It is in an embryo with three copies of chromosome 21 instead of the usual two. So if the pairs of 21st chromosomes in either the sperm or the egg then it fails to separate to form an egg.
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