Did you know that the most common disorder from meiosis is Nondisjuntion?!
Nondisjunction can occur during anaphase of mitosis, meiosis I, or meiosis II. During anaphase, sister chromatids (or homologous chromosomes for meiosis I), will separate and move to opposite poles of the cell, pulled by microtubules. In nondisjunction, the separation fails to occur.
Nondisjunction is the failure of chromosome pairs to separate properly during meiosis I or II.
One example of a Nondisjunction disorder is down-syndrome. It contains one extra chromsome.