Meiosis chromosome number polyploidy

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=ljJIxhxUREo

Nondisjunction - a failure either of two homologous chromosomes to pass to separate cells during the first meiotic division, or of the two chromatids of a chromosome to pass to separate cells during mitosis or during the second meiotic division. As a result, one daughter cell has two chromosomes or two chromatids, and the other has none. If this happens during meiosis, an aneuploid individual (for example, a child with Down syndrome) may develop following 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