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23 January, 18:54

19 Down syndrome is a genetic disorder caused by the

presence of an extra chromosome in the body cells of

humans. This extra chromosome occurs in a gamete as a

result of

(1) an error in the process of cloning

(2) an error in meiotic cell division

(3) a gene mutation

(4) replication of a single chromosome during mitosis

+2
Answers (1)
  1. 23 January, 19:21
    0
    I think it's number 2
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