1 The third reason is called as non-disjunction. 2  Non-disjunction is the inability or failure of homologous chromosomes or sister chromatids to separate in meiosis or mitosis. 3  As a result some gamete or cells may contain an extra chromosome and others that are missing a chromosome.
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Top 25 Romantic Weekend Getaway Ideas in the U.S. A trip to a relaxing resort or an inn can rekindle the romance that has taken a back seat to hurried daily life. Top romantic weekend getaways in USA include lakeside hideaways, golf & spa resorts, city hotels and coastal escapes for couples.